In general, I just use scene distinctions to be distinctions that people can use when they want to and not much else.
Last night I tried using a couple as actual game mechanics.
The Hulk (the badguy in this scenario) was headed for a nuclear power plant. Of the four heroes, one flew straight to the power plant, one lolly gagged and then flew to the power plant, and two took a side trip first and then headed to the power plant.
So I started the action scene with a scene distinction The Only Superhero Around and told the players that they'd need to get rid of that distinction before the second hero could show up on the scene. Iron Man spent his first action distracting the Hulk and delaying him (using his effect die to get rid of the distinction and then had the second guy go next. I then spent a d8 out of the Doom Pool to add a new scene distinction Only One Other Hero Around. The second hero on the scene ignored it, so when the next hero went, he used his action to try to get the last two heroes to the fight scene. I think he failed, but the next hero to go succeeded?
I thought it worked out ok. Narratively, it made sense that he heroes wouldn't all be at the fight scene when it started, but this gave us a mechanic for how long it would take them to get there.
