I am building a plane that will have flaps. What's the best way to set up the Eclipse 7 to use the flaps?

It's as easy as using the Flap channel and a knob or you can make it more complicated. What’s your desire for use, switch with a few deployment percentages or a rotary knob, a mix with elevator linked to compensate for pitch or?

I would like to compensate for pitch changes with elevator mix. Is this possible using channel 7 for flaps?

What’s your specific set-up or channel assignment? Channel 6 is generally used for Flaps, Channel 7 maybe mixed used this purpose but you'll have to use free mix for the Flap-Elevator needs I believe.

There is a dedicated mix available for "flap-elevator" mixing and there is also one called "Landing". See page 23 of your manual.