Altering ALL bow spells/arts/knowledges so that you can use them on the run!! Open shot is GREAT, because I use it when I backpedal... wounding shot is USELESS because I have to be stationary.
Remember, these are COMBAT ABILITIES and Rangers are meant for MOBILITY. Why is it that I can use my flanking backstab arts three to four times in the time it takes for my Open-shot ability to recharge? Aren't I supposed to be something special with a bow?
Also, make impede a little more potent. Raise the recast timer, halve the duration if you have to, but make the spell actually work!! Slowing a screaming eagle down by 25% doesn't really make that much of a difference. Slow them down enough... even for a shorter period of time... just so we Rangers can get back into range without having to blindly scramble our way through an aggro zone.
Do this and Impede will become an actually useful skill IMHO. It might even outweigh Escape as a means of bailing out of an encounter.