I say, make Guerilla trigger from from Invis/ShadowWalk /Sneak. For balance tweak, get noticed that 2 Scoundrel's status related skills have 150% dmg. IMHO That is not correct. So nerf these Scoundrel's 2 attacks skill(s) a bit. Minus 15%? That way general damage would be similar but bursting promoted.
I don't see any justification for a nerf like that. Guerrilla is supposed to be more the Rogue's thing. Those 150% damage skills have significant cooldowns anyway. You can't do them every turn.
Sure you cant, that is the point. Guerilla triggered by Invis/ShadowWalk/Sneak has similar cooldown. (given by those precursors) That is the guerila is not every round flat bonus but BURST damage .
Hide --> bank up AP --> Get to position --> BURST.
That is Guerilla.