I'm not sure that it is possible.
if someone could make an FX browser script that can be more flexible/organizable than reaper's fx browser it will be very useful addition!
few things that I do like in such a browser:
1. ability to create a folder inside a folder.
2. ability to attach/use ICONs for plugins (visual selection)
3. plugin rating column - 1-5 stars
what do you think?