Prior to the new Blizzard policy change does anyone recall there ever being problems or warnings for folks using a software KVM like Synergy, or Barrier (fork of synergy), Input Director, etc. when dual-boxing two physical systems?

e.g. dragging mouse over to the other PC screen for some actions, dragging it back to main PC.

I have not been able to find any reports of this not being allowed at any time, or reports specifically mentioning it. Does anyone have experience otherwise?

After the Blizzard policy on input broadcasting to multiple clients I wouldn't think it matters now either as synergy and similar KVM software only lets you focus keyboard/mouse on a single client at a time.