1. Yep, this is mostly fixed in this month's version, in that only Trudy tries to ride you - the actual mechanics of it aren't fully fleshed out.
2. This is something that will be addressed - overall the arousal mechanics are unfinished (see point 1).
3. Yeah, getting opponents into position is going to be easier; in particular, they won't always be able to immediately stand up (and that'll be true for the player character as well).