With the trade 225 skill, you can trade fiefs to any lord. Thus, this will sort of allow you to "grant" fiefs. (I know, trade 225 takes a long time to get... but just saying this is the only alternative in the base game). Now if only the trade skill wasn't a POS to level... Even without having to get to the absurd 225 skill requirement.
Added Grant fief option appears onEnterSettlement. Lords list is now sorted with the player at the top, then by towns then by castles. In v0.0.6 You can close the grant fief option box and it will re-appear when you enter the captured settlement as long as a vote has not passed.