Stage specific action groups

[Atoning Unifex]

I've been contemplating this suggestion for quite a few months because in all honesty I can't decide whether it's that useful or not!

Basically I think that for each stage created there should be an action group associated with it, which is triggered automatically when the stage is triggered. I'm not referring to the 'stage' action group that triggers for every stage, but a numbered one that triggers when that numbered stage is. Uses for this would be things like, automatically deploying solar panels after fairings have been discarded, or after release from the launch vehicle. Activating/deactivating reaction wheels at various stages of launch. Pretty much anything that can be done using current action groups now.

I think overall this would give us loads more flexibility for vehicles without having to remember specific action groups to trigger, and freeing up action groups for other uses.

Anyone else think this would be handy?