When making a comp out of a rate-stretched clip on the editor timeline, HitFilm currently doesn't juggle the footage properly. For example, say I have a 3-second clip in my editor timeline, and I rate stretch it 300% so that it becomes a 1-second clip. If I right-click on the clip and choose "Make Composite Shot", no matter what choices I set in the dialog box, HitFilm will make a comp that only contains one second of the original footage, instead of the full original three seconds. I'd like to think that determining the un-stretched length should be fairly easy when it comes to putting the correct amount of footage into the new comp, but it's not currently working.
On top of that, if I choose "Move With Clip" for the Effects and Transform Properties option when making the comp, the rate-stretch (in my mind) should move to the clip embedded in the comp, but it doesn't. The rate stretch is simply removed from the comp on the editor timeline, but no stretch is applied to the clip in the comp.