RE: Multiple Servos/Motors
Is this for a twin engine electric plane? if so, why do you want separate channels for the two brushless motors? Just Y-connect the two ESCs to the receiver and hook up the servos as you would with any other plane (use a Y for dual aileron and flaps servos if necessary).
The recommended way to set up dual brushless motors/ESCs is:
1) Use one common battery pack for both ESCs (with a Y-connected power lead)
2) clip the power lead one of the ESC receiver connectors if necessary. This is necessary if both ESCs have a BEC (voltage regulator), and if the BECs cannot be connected in parallel. Some ESCs with BECs can be connected in parallel, like the Castle Creation Phoenix line of ESCs.