Thanks for the comment and I'm glad you enjoyed it overall!
To answer questions;
1) Power can be optionally used every time you roll dice, but you have to use it all or none. Control can be used once per round per point (the way you did it).
2) Correct, effects don't count while you're teeing off.
3) Correct, scores are counted up from zero; par is only there as a suggestion and for your competition in solo play.
4) Only one person gets the special club each hole (I believe highest score overall was the intent), unless there's a tie for highest score, in which case everyone who tied gets it.
5) Progression is intended to be for the highest score on that particular hole, not highest score overall. That said, for both clubs and progression, it's not a big deal if you do overall instead