THere's a tool created by LogicDragon that can take any skeleton.nif you have installed and auto make the changes that convert them to Realistic Physics and Force compatible. I used it on my install to convert the Universal Skeleton from Growlf, and it worked. Now I have Universal Skeleton + Breathing Idles (from the BBB package) + the Realistic Physics and Force pagage installed, and it's working fine.
It's simple to use... download both files, extract the RRSC to a subdir inside Oblivion folder (I've put mine on Oblivion/Tools) and run the ScanNif.exe... that copies all the skeleton.nif it finds installed to the ./in folder of the tool. After that, run the converter (run "RRSC.exe 1" for normal skeleton, and "RRSC.exe 2" for a collidable skeleton) and it converts and copies all the skeleton.nif in "./in" to "./out", move the ./out to Bashed Installers (if you're using BAIN... why wouldn't you ) and you're good to go.
Be careful not to apply the tool on skeletons that are already RPP converted!
For any interested, here's the link to the tool, and to the updated RPP package:
http://www.nexusmods.com/oblivion/mods/38427
Best regards,
Leandro