The Speed "Cheat"

[vif]

Puke, its actually the opposite.

Having lift killing devices (spoilerons) on top of your wing increases parasitic drag on the wing going down, offsetting the increase of induced drag on the wing going up. Induced drag is mostly a byproduct of lift. This reduces the adverse yawing effect a regular aircraft (ailerons) experiences.

As an example, in a regular aileron aircraft when you turn LEFT:
Left wing aileron goes up into the airflow, spoiling lift, reducing induced drag, causing wing to drop.
Right wing aileron goes down into the airflow, increasing camber, which increases lift, causes right wing to rise, but also increases induced drag due to increased lift on right wing.

So...
Left wing less induced drag
Right wing more induced drag
Airplane now wants to yaw to the RIGHT.. which is opposite of where you are rolling to.

With spiloerons the so called "opposite yaw" effect is greatly reduced, and reduces the amount of rudder needed to keep the aircraft in a coordinated turn.

Viff

[vif]

added to that, the reason pilots prefer using rudder input to roll at low speeds and high AoA is due to the fact that if they were to use the ailerons they might stall one of the wings in such extreme conditions.

[Griego]

Spiraling down was a tactic use by the luffwabbles in WWII. It works really well in a 190.