Setting priority upon cycles launch

Is it possible to add tick box at Save View to set the application priority when working with Cycles?
I’d find extremely useful when 2 or 3 instances ar open and running well without being drastically slowed down by render working in background.
I know it’s possible through system Windows control but I’d rather avoid it.
Maxwell has (had) it.

Raytraced is already running on BELOW_NORMAL priority for CPU threads. Cycles has no throttling or priority for GPU threads.