I think that 5 actions with bird cards would be too much, I prefer the Idea of letting the cat access more actions by building lots of one type of building.
Perhaps an alternative bonus to workshops? Right now no one builds many workshops in our games, its all about just enough Sawmills to build all the Recruiters. Anything else is considered subpar. Without more cats you won't have the muscle to rule and build, plus your card draw is tied to them.