BSF
Explorer
Umm, I informally wing it. Well, maybe not entirely I suppose. For stuff that is similar to Divine spells (Druids, Paladins, Cleric Turning) I pretty much work that into their prayer time. For Barbarian Rage, I might dictate that you need good rest. Unless the barbarian was very totemic and used the rage like that. Then I would treat it like Divine Magic. But, basically I leave that up to my players. If they have a cool flavor concept that they want it to work around, I am generally fine with it. If they aren't sure, and it is suddenly important, we will make it up on the spot and it will "stick" after that.