Stuff like limiting the amount you can overdo something in PP, or having rewards/penalties associated with various actions, will doubtless come in time. Along with the famous 10 year plan, I get the distinct impression that additions (such as PP) are timetabled to be implemented in one season, then not revised or significantly worked on for a season or two ... kind of like they figure their first effort will be pretty good, so they can take a good while to look it over and fix the 4 bugs they imagine they'll find. (Rather than having a short cycle of release/review/revamp and fixing the 8 trillion bugs that are actually there...)
8 trillion is probably an exaggeration though.
I genuinely believe that PP will, eventually, get a decent rework effort put into it, but I also genuinely believe it won't happen until scheduled - and I doubt it's on the schedule for anytime at all soon. Obviosuly everyone will have stopped playing it by then, but hey ho...
Dave