Hey there,

My car stereo has a grip that you place your phone in to, making your phone the UI for the player. This requires either huge UI buttons to skip / pause etc while driving, or the ability to swipe across the screen to skip (I skip a lot!).

Poweramp did this, but poweramp has some crappy bugs like losing the lockscreen widget when it gets paused.
Google Play Music also has this, but GPM can't play .wma files.

Not sure if this is something a skin might be able to handle - maybe a skin that makes the horizontal playback controls UI really big or something. Either way, swiping from right to left to skip tracks is a pretty useful music player function I think.