At this time, we don't have that ability. The hardware can certainly do it, and the feature would be implemented entirely in firmware. It may be in a future release, but the list of requested changes is pretty long. I'm trying to prioritize the list by a combination of 1). how many people have requested the feature and 2). how difficult the feature is to implement. All I can say for sure is that it won't be in 4.6, which is hopefully about to get started. 5.0 will be a much larger release and I might be able to get it into that.