Z3 scrolling is generally considered to be much too much effort to be practical. It involves fighting with ZC in almost every way. If you want to see Z3 scrolling you will have to wait for a revision of ZC or a new ZC like project.
Explain what you mean by pots.
Isn't there already a horse script? Honestly I don't see the how it would benefit to gameplay.
I agree we need more custom enemies but I don't think that is really core gameplay.
I don't think that would be hard but once again I dunno if that really enhances gameplay. I was thinking more like rolling or dashing, holding and throwing pots/bushes, MoscowModder's ALTTP Map script, etc.