Show the menu bar in gvim only when pressing an accelerator key (or f10), and hide it again when it is no longer required
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shymenu will show the menu bar only when the user presses an accelerator 
key. The menu will be hidden again after an item was selected.
shymenu achieves this by defining key maps for those accelerator keys 
(see 'winaltkeys') that would normaly activate a menu.

On a terminal, shymenu will define accelerator keys for the |:emenu| 

In order to use this plugin, remove "m" from 'guioptions' by adding 
something like this to your |vimrc| file, which will hide the menu bar 
by default: >

   set guioptions-=m

See also:

Many thanks to A Mechelynck for making me aware of 'wildcharm' and the 
trick with |:emenu|.


Status:  Works for me (there may be some minor quirks)
Install: See
See for related plugins.