RIP Rickey Henderson

Yes - that's a pretty solid analogy. Some of Wilt's scoring stuff is wild - but that was also a pretty big rule change, so it becomes hard to compare. I don't think there were any truly significant rule changes relating to stealing bases, have there been?
Yes, but you have to go wayyyyyyyyyyyy back. Prior to 1898 if a baserunner took an extra base on a hit he was
credited with a steal. Ie, going from 1st to 3rd on a single.

https://en.wikipedia.org/wiki/Stolen_base