It is a later test version of Brr's FFB patch.
I cannot remember what the difference is compared to FFB2.xml but I remember Johnny Ackermann raving about it on VROC and I think it was him that sent it to me.
If anyone knows any details then please feel free to add them.
If this is already available somewhere and i didn't spot it then feel free to remove this topic.
Place in your GEM+ options folder and activate inside of GEM+