I know one thing people said they'd like to do with Bandicam is record from a webcam/camera. I've heard that feature would be hard to make, so, I thought I'd suggest something else.
Would it be possible to set two target windows for recording? That way, you can set one target as your game and another target as your webcam preview software or something. I have no idea how easy this would be, but figured it was worth a suggestion.
Another suggestion I have is to set individual programs/targets to record audio from. Again, not sure if this would work, but this way you can keep your audio files from you game, voice chat, and your mic separate. I like to save my audio files during recording to make editing easier, but this could also work well if you have two people recording their own audio from different machines (you can both record your own voice and audio without getting your friend's audio mixed in with your game sounds).
I wouldn't be overly bothered if these features don't make it into Bandicam. And I realize they may be overly complicated for the end result. I'll still enjoy the software, regardless.