Rubber bullets operate under the principle of causing sufficient pain to deter the offender. It's functionally impossible to incapacitate someone with rubber bullets unless you're taking distinct risks with their life, ie, shooting around the head/exposed vital areas at close range.
They hurt. But pain is manageable, frankly, as anyone who plays paintball will tell you. Eventually, you just get inured to it. Rubber bullets move faster, but are lighter, so the difference isn't that incredibly profound.
As far as paintballs go, there actually are crowd control variants available to law enforcement. Pepper paintballs, and what are basically "skunk" paintballs (truly foul odors), but similar to rubber bullets, they're really intended as a crowd control weapon.
Tasers aren't popular, I realize, but they're really not a bad choice in most situations where someone could get seriously injured. I have a bit of an issue with tasers being used to enforce compliance, but again, 90%+ of the time the taser is probably going to cause less injury to a suspect than being manhandled will, at less risk to the officer.
It's also significant that, by the time the tasers come out, you've almost always already crossed the line of non-compliance.
I've been stopped by the cops because of where I happened to be, at what time of night, etc. I was polite, respectful, and even though I looked like a freaking hobo through a significant fraction of my teen years, I was invariably released because I was polite, respectful, and well-spoken.
If an officer stops you, chances are he has enough of a reason to justify it to a court if pressed. At that point, getting belligerent might make you feel better on some level, but it's really just going to land you in considerably more trouble than you might have been in otherwise.