Try it, you won't like it!
When both flaperons are down as far as they can get, the aileron function kinda reverses..
The down going aileron can't go down any further, the up going aileron goes up.
The result: The drag on the down going side stays the same, the drag on the up going side reduces.
The plane yaws towards the down going side.. opposite the intended direction.
It is very disorienting.
Crow is a better choice.