Time and time again, I repeatedly have to do /res friend clear to see which friends I have on my plot, and then re-add the ones that I need to keep. A command such as /res friend list would be useful in listing who you actually have as a friend. This potentially could be the difference between an easy /res friend remove or a /modreq explaining that someone on your /res friend stole from you.
[Also, sorry about the influx of suggestions from me, I'm just blurting out all these things I had in my mind for a while now.]