If you are using Futaba, you might look into the S bus setup. This would allow independant trim of each servo. It seems with the great transmitters we have, the biggest problem is getting all of the servos plugged into the RX. The Y harness will work, but you just lose some control, and everything will have to be setup just right mechanically.
Another option might be one of the Power expander set ups. I have never used one, but the IMAC style aircraft do, as it expands the number of RX ports for a given channel. I think Smartfly makes some of these.