RE: Lengthen the Y harness
If you have a computer radio with more than four channels, use two separate channels for each aileron then run the cables, one to channel 2 the other to channel 6 (Airtronics RD6000 and RD8000.. others may vary with channel selection but do the same thing). Then set the radio up for flaperons, follow instructions on end points and dual rates and off you go. No more Y connectors. Just a suggestion... no flames please.