On a Futaba 3vcs I use idle up on the throttle when in the sheeted in position, using a 3 position switch this gives me
High mode: Pointing closer to the wind but going slower, (sheet in 5%)
VMG mode: The best VMG for your boat
Fast mode: Pointing less into the wind but going faster, (sheet out 5-10%) This also helps when wind is at the top of the range for a rig.
The 3VCS was a specialised car Tx so not sure if aircraft idle up can be made to work the same.