I always had 150+ arrows in my invent... they were in plentiful supply. I also had a mod which increased arrow speed by 125%, max distance by 125%, and damage by 25%.
I liked oblivion arrows anyway, without my mods. They should keep the oblivion arrows, although make them a little bit faster, and make bow damage more dependant on arrows rather than bow.
I mean, a bow's a bow, right?
Erm, nope. Straight, recurve, compound, the wood or materials, size, etc.
As long as I don't need to put 20-50 arrows into a target I'm good to go. If I can perch and shoot, all the better! Backpedaling at half-speed? Great!
Also, if there are more variety in the arrows themselves, as in what's found in the Thieve's Arsenal (knock-out gas, grease, dousing, etc.)