Fast Layer Replace

Idea: R switch button, on right side of a layer header. If layer is marked by Replace switch, on next load embeded action it will be deleted.
So, f.e when performing i can have a list of presets in sequence, and then only mark layers R and choose next preset. Instruments will be replaced but those that were playing will still play.
Also maybe this R tag can be midi assignable, to be able to use some button on controller, mark one of 8-16 perfomance tracks and quickly replace them, without need to touch a mouse...