[plt-scheme] editor: managing comments

Hi,

I have a couple of suggestions for enhancing the managing of comments  
in the DrScheme editor.
I maybe missing the way to do this already, in that case please tell me!

a) keyboard shortcut for
. comment with box
. comment with semi-column
. uncomment
(i've seen there is a way to add user-defined keybindings, but I'm not  
quite sure how to get the above---and arguably this deserves a proper  
treatment by default, since commenting in/out code is a fairly common  
activity and IDEs usually have these shortcuts)

b) when right-clicking on the ";" of a comment box, the only option is  
to convert to semi-colons comment. Would be nice to have an  
alternative to simply uncomment the box.

some very mundane requests, I admit!

Cheers,

-- Éric