Hi,
Not a real fav list, but the fsm browser editor has an option to list the msot recent fsm, I use it quite a lot on complex projects. it helps.
But yes, more goodies such as fav list would be good. I would however put a warning flag, are you for example using the unity new asset browser features? I just can't work with it... very odd, me that always strive for that, I find it totally unusable, so doing this kind of stuff is always a hit or miss and never actually ends up satisfactory for everyone unfortunatly.
bye,
Jean