Ben. I run 2 complete computers until I can get a cord to connect my laptop to the bigger moniter, But until then I have one external USB mouse. 
I would like to challenge you to build a USB switch. On one end you plug in the mouse, then it splits into to rather long USB dongles and plugs into two different USB ports and has a switch on top to use one mouse for both computers...
Good luck,
Ben Galloway
Orange Park FL
