Will this motor controller take more motors?
No, it won't take any more motors .

Just ran a few tests for two motors connected in parallel to the same power supply as would be used by the controller. - here are the results:


Measured start current: 0.88A at  circa 4.9V
Measured running current: Anything between 0.2A and 0.6A, also circa 4.9V
Measured STALL current: Generally above 1.8A, voltage can drop to around 3V for one or both motors stalling, which also results in a current of around 2.2A, which is too big for the motor controller to handle...


Just have to find another one, I guess...