Bluetooth switcher?

Do you mean something like this?

http://www.amazon.com/Multi-Link-Bl...eywords=bluetooth+keyboard+multiple+computers

 

I don't think any such device exists, but I suppose it would technically be possible for such a device to exist (unless it would introduce more latency than the Bluetooth spec allows or something).

I think your best bet is to get a device like the Logitech K811 or Kanex BTKey. Unfortunately, those are only keyboards; I'm not aware of any trackpads on the market that support a similar feature.

However, is one of the computers always going to be on? If so (and assuming they're both networked), you can use Synergy and set that computer up as the server (assuming that is the one the devices are actually connected to). Synergy allows you to move the mouse from one computer to the next as if it they were the same computer, and I've found it to work very well and be quite convenient. Have you thought of this possibility?

 

ShareMouse should work smooth as shown in the video at http://www.keyboard-and-mouse-sharing.com/demo.htm

Into what issues did you ran into, please?