An uncommanded roll on final would indicate a stall, unless gusty winds were present. I realize I'm getting into this conversation late, and after the main question had been answered. A stall can occur at any speed - it's angle of attack that's important to consider.

Also, if the plane drops a wing at the time of the stall, that means one wing stalled before the other one. During a power-on stall, this can be caused by the torque of the propeller, a yaw component or both. With power off, I'd be more inclined to think it's almost completely due to yaw alone.

Because of this, most of your control problems at or near stall speed can be dealt with using the rudder. It would be nice to have ailerons - can't imagine being without them - but yaw is controlled with rudder, regardless of how many control surfaces the airplane has.

I don't want to get into a debate about that, so for the sake of model aerodynamics, I will defer to anyone with more than my meager experience. However, in a stall, I think ailerons actually detract from recovery, because of the extra drag they generate, causing even greater yaw, and a better chance that the plane will spin, rather than just stall.

Just my 2cents......