a.markdown

1. create ~/.vim/plugin/kowey-bufmenu.vim by copying/patching your system vim/runtime/menu.vim
2. edit your ~/.vimrc (not .gvimrc!), and insert let no_buffer_menu=1 BEFORE any set syntax directives (apparently they trigger the menu)

kowey-bufmenu.patch

--- /Applications/MacVim.app/Contents/Resources/vim/runtime/menu.vim	2011-09-18 15:00:37.000000000 +0100
+++ /Users/kowey/.vim/plugin/kowey-bufmenu.vim	2013-11-03 13:34:03.000000000 +0000
@@ -13,8 +13,8 @@
 set cpo&vim
 
 " Avoid installing the menus twice
-if !exists("did_install_default_menus")
-let did_install_default_menus = 1
+if !exists("did_install_kowey_menus")
+let did_install_kowey_menus = 1
 
 
 if (exists("v:lang") || &langmenu != "")
@@ -640,7 +640,7 @@
 unlet s:n
 unlet s:idx
 
-if !exists("no_buffers_menu")
+if !exists("no_kowey_buffers_menu")
 
 " Buffer list menu -- Setup functions & actions
 
@@ -827,9 +827,10 @@
     let name = fnamemodify(name, ':p:~')
   endif
   " detach file name and separate it out:
+  let dname = fnamemodify(fnamemodify(name, ':h'), ':t')
   let name2 = fnamemodify(name, ':t')
   if a:bnum >= 0
-    let name2 = name2 . ' (' . a:bnum . ')'
+    let name2 = dname . '/' . name2 . ' (' . a:bnum . ')'
   endif
   let name = name2 . "\t" . <SID>BMTruncName(fnamemodify(name,':h'))
   let name = escape(name, "\\. \t|")
@@ -1115,7 +1116,7 @@
 
 endif
 
-endif " !exists("did_install_default_menus")
+endif " !exists("did_install_kowey_menus")
 
 " Define these items always, so that syntax can be switched on when it wasn't.
 " But skip them when the Syntax menu was disabled by the user.