I only use AP (accept & pause) or D (deny) however, I did make a suggestion that maybe an overhaul of the filters in rss might be useful, so full regex filtering might be implemented as I have a rather extensive whitelist and extensive blacklist.
I also have a few wildcards which are designed to capture all, but I end up with too many duplicates if using multiple rss feeds, because of slight tag changes between different indexer, but they are the same exact file.
Someone else might be able to explain how F, P and R can be best used, but I've never used them in the years that I have been using Alt.Binz.