While you don't actually need to do any coding in RPG Maker, to go beyond the basics you will actually be working in two separate systems: the simple event system and then the much more powerful scripting system using Ruby. Most XP games rarely go beyond the former (maybe adding in Yanfly's plugins). But, as you noticed, Curse of Pleasure is based off Scale Garden's stuff which makes heavy use of the the scripting system (in particular to achieve the boob bounce). I've never tried modding Curse of Pleasure, did play around with some of Scale Garden's stuff and
Spin around Sayla (latter also used Scale Garden's methods). Uffffff!!!!! the coding got the job done and had some very interesting ideas but the implementation... I believe the real reason Rannero avoids working on this is that he is an artist, not a programmer and the framework he is working in from Scale Garden makes it painful to evolve the game.
Good luck with your attempts, there is already plenty of raw material in this game for one to exploit.