If you could regulate something relatively inconsequential, what would it be?

Already is, just that nobody enforce this.

Ok, but if you are still tailgating me in the right lane because I'm doing the speed limit, I'm allowed to deploy James Bond style gadgets from my car at you.

While I understand this, are you referring to freeways only?

Or do you include any street with a > 30 mph speed limit regardless if I need to be in the left lane for the stoplight in 1.5miles?

It's almost always safer to sit in that lane when it's busier than changing lanes ever last minute

But that's already regulated.

Tell that to the civil engineers who designed spaghetti bowls full of splits and left-exits and ignored surface street routes and mass transit so even when the freeways are moving at the speed limit there is enough traffic that there is no guarantee there will be enough space to move over at the perfect time.

This is a lovely enough idea for actual intercity travel, and it only takes a couple of clueless asses to make that frustrating, but I see people who think it's actually realistic in populated areas and I shake my head.