Two Motors one PWM help?

[Jefferson]

Originally Posted by notmattlythgoe

This unfortunately is not legal, each motor controller must be hooked up to one port.

Of course I'm not on the GDC, but I don't believe you are interpreting that correctly. The rule is there to prohibit teams from controlling servos, motor controllers, and relays with things other than the roboRIO. So a team can't have a Talon PWM cable plugged into an Arduino. It must go directly to the roboRIO.
I've never seen anything outlawing PWM splitters. In fact, they were included in the kit for years. Maybe as recently as 2013?

Now back to OP: are all of these motors drive motors? If so, why not have both sides on PWM splitters or both sides on two PWM outputs. Seems like things are necessarily complicated.