Alexander,
A very nice and thoughtful explanation – however…
Your technique for applying an overall speed change to a clip via the media is only workable if your clip is a shot already broken down on the rushes roll as a separate entitly. If your rushes were done on a professional format with backspace recording, your rushes will be a continuous 40 minutes or so. Although you have specified the exact section of rushes you wish to send to Motion, applying an global 50% speed setting turns the whole rushes duration to 50%, and suddenly you’re looking a a slow-mo’ed bit of footage you didn’t want. Having to first export and re-import footage as a new clip is ludicrous. Why isn’t that a user-definable command within Motion’s import function?
There’s a simple analogy to this: I select a book in a bookstore and when I get to the cash desk, I find they want to charge me for the entire shelf. It doesn’t make any more sense in Motion, and to create unnecessary within tight-time workflows is insane. The only reason I can think of is that other (Avid) systems have sewn up the copyright on any sane way to produce exemplary slow mo’s. And if any of you are able – check out the Avid speed ramp tools / graphical interface, and you’ll see what I mean!
Good luck with your speed fx.
Rodney