diff --git a/README.md b/README.md
index af058940..8a3b668d 100644
--- a/README.md
+++ b/README.md
@@ -100,6 +100,7 @@ turn almost any device into a file server with resumable uploads/downloads using
         * [custom mimetypes](#custom-mimetypes) - change the association of a file extension
         * [GDPR compliance](#GDPR-compliance) - imagine using copyparty professionally...
         * [feature chickenbits](#feature-chickenbits) - buggy feature? rip it out
+        * [feature beefybits](#feature-beefybits) - force-enable incompatible features
 * [packages](#packages) - the party might be closer than you think
     * [arch package](#arch-package) - now [available on aur](https://aur.archlinux.org/packages/copyparty) maintained by [@icxes](https://github.com/icxes)
     * [fedora package](#fedora-package) - does not exist yet
@@ -2137,6 +2138,15 @@ buggy feature? rip it out  by setting any of the following environment variables
 example: `PRTY_NO_IFADDR=1 python3 copyparty-sfx.py`
 
 
+### feature beefybits
+
+force-enable features with known issues on your OS/env  by setting any of the following environment variables, also affectionately knnown as `fuckitbits` or `hail-mary-bits`
+
+| env-var                  | what it does |
+| ------------------------ | ------------ |
+| `PRTY_FORCE_MP`          | force-enable multiprocessing (real multithreading) on MacOS and other broken platforms |
+
+
 # packages
 
 the party might be closer than you think
diff --git a/copyparty/authsrv.py b/copyparty/authsrv.py
index db9c1cdd..bfabd128 100644
--- a/copyparty/authsrv.py
+++ b/copyparty/authsrv.py
@@ -359,6 +359,7 @@ class VFS(object):
         self.lim: Optional[Lim] = None  # upload limits; only set for dbv
         self.shr_src: Optional[tuple[VFS, str]] = None  # source vfs+rem of a share
         self.shr_files: set[str] = set()  # filenames to include from shr_src
+        self.shr_owner: str = ""  # uname
         self.aread: dict[str, list[str]] = {}
         self.awrite: dict[str, list[str]] = {}
         self.amove: dict[str, list[str]] = {}
@@ -376,7 +377,7 @@ class VFS(object):
             vp = vpath + ("/" if vpath else "")
             self.histpath = os.path.join(realpath, ".hist")  # db / thumbcache
             self.all_vols = {vpath: self}  # flattened recursive
-            self.all_nodes = {vpath: self}  # also jumpvols
+            self.all_nodes = {vpath: self}  # also jumpvols/shares
             self.all_aps = [(rp, self)]
             self.all_vps = [(vp, self)]
         else:
@@ -2327,11 +2328,6 @@ class AuthSrv(object):
                 for x, y in vfs.all_vols.items()
                 if x != shr and not x.startswith(shrs)
             }
-            vfs.all_nodes = {
-                x: y
-                for x, y in vfs.all_nodes.items()
-                if x != shr and not x.startswith(shrs)
-            }
 
             assert db and cur and cur2 and shv  # type: ignore
             for row in cur.execute("select * from sh"):
@@ -2361,6 +2357,7 @@ class AuthSrv(object):
                 else:
                     shn.ls = shn._ls
 
+                shn.shr_owner = s_un
                 shn.shr_src = (s_vfs, s_rem)
                 shn.realpath = s_vfs.canonical(s_rem)
 
@@ -2386,7 +2383,9 @@ class AuthSrv(object):
 
         self.js_ls = {}
         self.js_htm = {}
-        for vn in self.vfs.all_nodes.values():
+        for vp, vn in self.vfs.all_nodes.items():
+            if enshare and vp.startswith(shrs):
+                continue  # propagates later in this func
             vf = vn.flags
             vn.js_ls = {
                 "idx": "e2d" in vf,
@@ -2444,8 +2443,12 @@ class AuthSrv(object):
         vols = list(vfs.all_nodes.values())
         if enshare:
             assert shv  # type: ignore  # !rm
-            vols.append(shv)
-            vols.extend(list(shv.nodes.values()))
+            for vol in shv.nodes.values():
+                if vol.vpath not in vfs.all_nodes:
+                    self.log("BUG: /%s not in all_nodes" % (vol.vpath,), 1)
+                    vols.append(vol)
+            if shr in vfs.all_nodes:
+                self.log("BUG: %s found in all_nodes" % (shr,), 1)
 
         for vol in vols:
             dbv = vol.get_dbv("")[0]
diff --git a/copyparty/httpcli.py b/copyparty/httpcli.py
index f439d6c1..886d7cb9 100644
--- a/copyparty/httpcli.py
+++ b/copyparty/httpcli.py
@@ -5012,6 +5012,8 @@ class HttpCli(object):
     def get_dls(self) -> list[list[Any]]:
         ret = []
         dls = self.conn.hsrv.tdls
+        enshare = self.args.shr
+        shrs = enshare[1:]
         for dl_id, (t0, sz, vn, vp, uname) in self.conn.hsrv.tdli.items():
             t1, sent = dls[dl_id]
             if sent > 0x100000:  # 1m; buffers 2~4
@@ -5020,6 +5022,15 @@ class HttpCli(object):
                 vp = ""
             elif self.uname not in vn.axs.udot and (vp.startswith(".") or "/." in vp):
                 vp = ""
+            elif (
+                enshare
+                and vp.startswith(shrs)
+                and self.uname != vn.shr_owner
+                and self.uname not in vn.axs.uadmin
+                and self.uname not in self.args.shr_adm
+                and not dl_id.startswith(self.ip + ":")
+            ):
+                vp = ""
             if self.uname not in vn.axs.uadmin:
                 dl_id = uname = ""
 
diff --git a/copyparty/svchub.py b/copyparty/svchub.py
index 560355f2..7213a7d2 100644
--- a/copyparty/svchub.py
+++ b/copyparty/svchub.py
@@ -1260,7 +1260,7 @@ class SvcHub(object):
                 raise
 
     def check_mp_support(self) -> str:
-        if MACOS:
+        if MACOS and not os.environ.get("PRTY_FORCE_MP"):
             return "multiprocessing is wonky on mac osx;"
         elif sys.version_info < (3, 3):
             return "need python 3.3 or newer for multiprocessing;"
@@ -1280,7 +1280,7 @@ class SvcHub(object):
             return False
 
         try:
-            if mp.cpu_count() <= 1:
+            if mp.cpu_count() <= 1 and not os.environ.get("PRTY_FORCE_MP"):
                 raise Exception()
         except:
             self.log("svchub", "only one CPU detected; multiprocessing disabled")