No, it increases the stall speed. Up aileron reduces or even reverses the camber, thereby reducing or even reversing the lift force and turning it downwards. The remaining part of the wing now has to produce more lift at the same speed and it can only do it by raising its AoA, so it reaches its stalling angle at a higher speed. Crow adds drag but does so by demanding more lift hence more induced drag from the remaining portion of the wing. If you want drag that's fine but your stall speed has gone up. Gliders that tend to have very low stall speeds anyway don't generally care about that.
H