Acceptable by me. Unless Kinook is going to develop a new RT editor for UR, which I don't see happening.
If I really need to format my text in a way that UR doesn't handle well I do it outside UR and then import or copy it into UR. If I couldn't do that it would be more of a concern to me. But since I can, well, it's a pain but not a deal-killer for me. Not even close!
Just my opinion...
Jim