1. Can I clip my tier run(s) for IL submissions?
2. If we want precise retiming, at what frame should the time start/end?

I can answer the second question. You want to start on the first frame of the first "press any key" screen when you start the first route. You want to split/stop on the first frame that the door's open for the last stop.

I'm not so sure about that. I'll have to think about it.