hah, was worried for a second that i'd misprogrammed a door item check or something but sidestepping the checks altogether is pretty clever
shooting while moving definitely takes getting used to, in that the projectile has the motorcycle's velocity added to it on launch - so driveby'ing an enemy to the right of the motorcycle, for example, requires placing the crosshair to the right of the enemy's position on screen, such that the added motorcycle velocity carries the projectile leftward into the enemy. alternately driving the motorcycle directly at an enemy will minimize this effect and then it's like a ranged jousting match