Completion and menu behavior

[Byron Foster <byron@base2.cc>]

Being an avid ZSH user I've recently spent some time learning the new 
completion system.  Very powerful stuff!  After adding zstyle entries in 
my .zshrc I tried to get the tab (complete-word) behavior to behave in a 
manner as follows:

lets say I'm in a directory that contains only files 'foobar' and 
'foofoo' and I type 'less [TAB]' at the command line.  Currently I will 
get a partial completion of 'foo' and that's it.  Now what I would like 
is that if I were to type 'less [TAB]' at the command line I would be 
given 'less foo' with the cursor following just after the partial 
completion, but *also* with a menu listing foobar and foofoo.  Now I 
have tried all combinations of completion options and styles to try and 
get this behavior, but none do the trick.  The one I believe should do 
the trick is AUTO_LIST since it's documentation indicates that it will 
always display a menu list with an ambiguity.  But I think that the 
problem is that a partial completion is not considered an ambiguity. 
AUTO_LIST does work in the case that if I type 'less foo[TAB]' then the 
menu does appear since no completion at all is taking place.  I don't 
want to use something like MENU_COMPLETE because a like the partial 
completions.

I may sound lazy since in the above case I could type TAB twice, once to 
get a partial completion then again to get the menu.  However, with this 
behavior one cannot tell on the first TAB hit if the completion of 'foo' 
is a partial completion or a full completion.  What I would like is for 
the menu list to act as an indicator of a partial completion in addition 
to displaying the possible matches.

I'm using zsh (4.0.4)
Any help would be appreciated!

Byron