Lots of ideas here and a lot of potential. The animal rules make perfect sense for the high-octane, low-sense world of FIST and I could totally see using those. After all the decades that inspired FIST did have Max, The Bionic Dog.
I think the rest have potential. Planning The Op warms my heart because of all the games of Shadowrun where planning the operation is half the fun. As presented, it's a dice roll, some bonus points and the chance of a problem, but you are definitely onto something. I also like the idea of complications as they remind me of FATE's aspects and points.
I probably wouldn't use this expansion as is, but I definitely want to pull it apart for all the ideas that would come spilling out. Well done.