Hi Aleina,
1. We consider to for future version. But I'm a little skeptical that this will be useful, because width of a waveform is very small (limited by a with of the video options panel), the peaks of the sound will be barely noticeable.
2. Reverse playback option. I'll reply in another thread today.
3. We plan to add some Save function for a Task in the future version. I agree that it would be very useful.
Currently you can to open the Tasks window (click the "Show Tasks" button), find a finished task and click to edit it. So you can continue editing with all saved options.