<good stuff>
Thanks. This was very helpful. Using the opponent's level to set the DC sounds like a very cool solution. I'll still ponder the limit of once per encounter. Because as you say, I don't want tricks to get old.
<good stuff>
In addition to the good stuff above, I'd add: the acrobatic stunt thing implies to me some sort of cool use of the environment. Swinging from a vine, catapulting off a springboard, etc. If it's just "I'm in the middle of the battlefield and I want to get past those guys", I'd set the DC much harder.
I would certainly allow the rogue to use Acrobatics to move through an opponent's square. Just like a fighter could use Athletics to LEAP over an opponent (if they were good enough or terrain permitted, obviously).
I don't think it's tough at all.Thanks for the responses so far. It's still a tough call for me, even with an opportunity attack.