I think I asked about this a long time ago, but I forget if there was a solution.
I have around 1,200 fonts on my system and all of them are represented in Red's style palette. I've broken them down into several categories such as "San Serif" "Serif" "Dingbats" etc. This involves rebuilding each category and then deleting what isn't needed.
What I'd like to do is add fonts as I acquire them without having to rebuild the entire category. I don't currently see a way to do this, but it would be a very nice feature IMO.