I would like to see an option to allow a ranger to "reset" his favored enemy. Too often if a campaign takes a left turn the ranger can get stuck with a bonus against creatures he's not gonna see. Perhaps we could follow the example of the sorcerer who has the opportunity at certain times to trade out lower spells; or, it could be an "anytime" function that simply requires the proper in-game amount of time and gold to gain the knowledge necessary to justify the bonus. Granted, it loses a bit of flavor ("Dragons destroyed my village! Ate my mentor! Violated my dog! Now I show them no mercy!... what we're going up against giants? Uh, I forgive the dragons, but oooh those darn giants make me so mad!!). But I think the benefit for the ability to still be relevant when the game has moved on outweighs the loss of "motivation".
Hmm, you posted a good question. Should be ranger be able to alter his favored enemies?
I just came up with the following idea: Everytime you gain a new FE (or maybe even every level), you can reduce one of your FE and increase another FE by one step.
Effectivly shifting bonuspoints over the time. So if a specific enemy leaves your focus of attention, your bonus slowly...
Oh my god. I had just another idea: Why not make the FE bonus changable from the beginning?
Let the bonus improve per level, but let the ranger choose a faverod enemy when gaining the next level!
He may keep the old one or take on another.
AND: in increasing level, he can have more than one FE at one time!
OH MY GOD THIS IS JUST BRILLIANT!
This is so brilliant it needs a bumb! ;)