No, I use separate mice and keyboards on my push-button or dial KVM switches.
Lately, on a customer's computers she upgraded to a wireless mouse, so I brought
along a USB printer sharing device that I bought for a scanner, but alas it
didn't work for it...I'm glad to report that she can now share 4 computers with
her wi-fi mouse. The 4-port KVM is still using the ps2 keyboard and VGA video
just fine.

At one of our local recyclers, I saw they had some of the bigger KVM switches,
but they used dedicated cables, so I passed them up. I've seen some on
Craigslist, too. Once I bought an 8-port KVM from EBay, but not all 8 would work
on it, so I traded with another tech that's better at soldering than I am.