I know I and others have mentioned this before, but I haven't seen it in this particular forum.
If there's one missing feature that means I have to take my project out of FlipaClip and onto the PC, it's the fact that I currently cannot make a single drawing hold for more than a single frame. This means that laying out key drawings to get a feel for the timing of an animation is not really possible. It also means that if, once you have your timing set up, you want to alter a 'hold' drawing, then you're going to have a LOT of copy/pasting to do.
It would be fantastic if you could grab the right hand side of a drawing on the timeline and drag it out to the desired number of frames - and if you could do this on a per-layer basis, then that would be even better.
Hope I don't sound like I'm complaining too much ... I love the app. :)