This wouldn't be a difficult enhancement. I'd probably add some sort of enum to indicate what edge the bar should be along. Some of the view layout logic would obviously need to change, namely the glow effect would need to rotate and reposition based on what position the bar was in (not a difficult thing, of course). This is not necessarily a high priority for me right now (I'd like to add some customization API for look and feel in the near term).

An optional swipe-to-hide/reveal feature is something I was planning on implementing. Look for that soon!