I have wanted to replace my IIgs mouse and integrate it with my KVM
("K-M" is probably a more appropriate term with the setup I have).
I've got a PS/2-style keyboard and optical mouse, and use an IOGear G-
CV160 PS/2-ADB converter hooked up to my KVM switch.
Connected to a Mac LC475's ADB port, there aren't any mouse-related
issues. But connected to a IIgs' ADB port, it gives an erratic mouse
behavior. Movement of the mouse will sometimes register a "click" in
GS/OS. So depending on where the mouse cursor is, the result of
moving the mouse ranges from benign to disastrous.