There's an analogy for my suggestion. A wage war action turns all military action from court to free and lets you go crazy with them. As if a regent action, a more complex type of action, makes court actions much simpler to execute. What I'm suggesting is along the same line.. To replace a more complex action for a number of actions of lesser complexity.
This is mostly for landed regents who have so much to do with their courts when you take into account the commoners, the vassals, decrees etc. I can understand that non-landed regents don't see the need for more court actions but they're vital for their landed counterpart.
As for magnificent courts and grand palaces, they're cute in theory, but for the purposes of a game that operates in 20 turn chapters, they're impractical and, unfortunately, more of an epic feat for a generation than anything one could really use. The magnificent court alone takes 15 turns to make and robs you of 1 court action per turn for the whole duration as per the new construction rules.