Change overflow impulses to variable actions?

[Verzen]

What if each overflow impulse cost 1->3 actions? Like heal/harm does?

That might be pretty cool.

[YuriP]

I see no problem with variable action impulses. Not even matter if they are overflow or not. Multi-action spells is always very interesting mechanic.

Including they could be an interesting way to put multiple different effects in same impulso and diminish the low number of feats problem a bit.