I have the Futaba 8UAF. On page 72 of the manual they describe the "revo mix" operation. There's three settings: Normal, Idle-up1 and Idle-up2.
Here's a couple of links to Futaba's site describing this tx:
The E-sky looks to me like a standard 4-channel tx, although it says 6 channel on the face, so there must be internal mixing or where would the other two channels be on the tx. That's my guess anyway.