rolling IS faster, and if you have a character with an Attack Speed boost, your rolls are faster too (counts as an "attack")
however rolling is tiring... there's obviously other ways of moving fast too (Spider's Bite, movement speed boost like Blade, flying (doesn't count as an atk though), teleporting, Charge/Tackle/Pounce/Lunge attack...)
the CPU controlled allies only run fast to catch up with you; you can't just start running faster yourself.
and lastly, you can modify items to just give you a movement speed boost (copy from Spider's Bite)