In one of the recent patches you could enable a reputation as an xp bar... I'd like to see that in BiB, and maybe support for multiple reputations. It'd be leet.
Or, if possible, make a xp/rep bar that can be moved on its own. Reason I ask is bacause I have my portaits hidden so I can use the mod ArcHud more effectively (provides ithe same functionality of the player portrait and target portaits areas, just in an arc).