Question about KVM mode

I have a laptop and a desktop. When using kvm mode, my laptop's display is duplicated to my desktop computer's display. Is there a way to switch keyboard and mouse to controlling my laptop without duplicating the display? 

I know I can use the seamless, but I have a reason for wanting to do it this way. 

Also, is there a way to use kvm mode while playing a full screen game?

I'm wanting to be able to play a game on my desktop, pause the game, hit the kvm hotkey, switch keyboard and mouse to laptop for whatever reason, then switch back to game.