Actually, Separate FK Tracks is what you are looking for. For example, if you check Arms the clavicle, upper arm, and forearm each store their own keys. What are you trying to do with that option?
I hate it to find my own thread at google :D OK i checked a bit around and saw: if i activate the "separate fk tracks" thingie for Legs and Arms for example and after that start to animate it works fine. But when i didn't check this before started working OR uncheck during the process all keys will be combined and stored…