An option for separate volume control for apps, have a basic default setting that all apps get by default but allow customization for individual apps if you choose to do so.
A good example, at least for me, is the only way I can hear incoming Skype calls is to have the game volume up in Words With Friends or the volume up for when I watch a video. If those volume are low, which is what I prefer, for some reason so is the incoming calls for Skype, if they are high, then I can hear incoming Skype calls. So an option to control sounds for individual apps would be nice, at least I think so.