Actually, i have a decent feral version that i'm using atm. It's no way near full and very simple but it uses rake, mangle, fearie fire and rip. It heals with regrowth under 50% and adds a rejuv if you are below 40% aswell. Use it if you want :)
The trick to using the feral specific spells (mangle and fearie fire (feral) is to use a macro/lua script instead. Further you have to input the exact rank of the spells in the macro. Note that i'm a total noob (started yesterday) so sorry if i'm missing something obvious here!