IIGS and 660AV coexisting

[msjohnso@sis1.softaid.net (Micah Johnson)]

Due to limited space, I'm trying to get my IIGS and Quadra 660AV to share
as much as possible.  I figure I can hook the Composite Monitor port
on my GS to the video in jack of the 660AV, and can essentially share a 
monitor by running a vidcap or TV monitoring program when running GS programs.
Then, using Appletalk I can share diskspace. 

Now, is there any way I can use the same mouse and keyboard?
Something like a switch that'll change which
computer the mouse and keyboard are working on?
I know plugging and unplugging ADB devices while the systems are running
is a Bad Thing, so this may be impossible if that rule is to be followed,
but any solution is welcome.

--Micah Johnson