[plt-scheme] Shortcuts in selectable-menu-item<%>

In my Plt 202 distribution, it doesn't seem to be possible to change 
menu modifiers except on X. For larger applications, its quite common 
on Mac OS to have modifiers like command-shift or command-option.

Is there a way to have combined modifier shortcuts on MacOS/Windows 
with the current distribution or a CVS built? Will they be added to 
later versions?

-- Erich