I don't understand the big deal with barrel rolls, unless you're talking about the inconsistency of their execution (ie: sometimes you pull one off when you launch from a certain jump, and sometimes you don't). Since they were introduced in Pure, I kinda liked them as far as that game was concerned. They feel appropriate in Pulse, too, because you can sometimes do one if you catch random air, and it's like "Hey, free turbo." It's a deliberate and intentional factor in the gameplay, so I don't see why you'd want to agree to not use them; unless perhaps you can make it akin to not using Piranha in XL or something. It's not like barrel rolls are like snaking/edge boosting/etc in F-Zero GX, or wave dashing and crap in Melee; it's not a quirk/glitch that people are exploiting or anything.