I also found a way of doing it on the Flysky ST8's, which use conditions which are hierarchial - so flicking a second switch overrides the options from the first switch :(

 

• In the CONDITIONS menu option, set CONDITIONS2 to SWD (switch 'D' on the right)
  
• In the RATE/CURVE menu option, with switch 'D' up ('normal' power on postion - screen shows 'C1' in a circle), I set the rate to 60% and the curve (EXP) to -100 - this gives less sensitivity for small stick movements and limits the rudder angle
  
• Flick the switch down, and the screen should now show 'C2', I set the rate to 100% (max rudder angle) but also the curve (EXP) to -100 - this still softens the initial movements of the rudder
  

 

For the sheet, we use a spare channel and mixer option, from the GENERAL menu:

• In the AUX CH menu option, set CH5 to SWA (switch 'A' on the left)
  
  
  
• In the MIXES menu option, set MIX1 to ON
  
  
  
• In the MIX1 menu page, with SWA in the 'normal' (up) position, and the sail stick set for sails right in, set the SWITCH field to SWA
  Set the master channel (M) to CH5 and the slave channel (S) to CH3
  Set NOR to 100%, REV to 0% and OFFSET to -10%; it is the offset that is reducing the endpoint (may be slightly different on your controller)
  Flicking SWA, you should see the master change form one side to the other, and the end point of the slave reduce slightly
                 

 

If you want this the other way round, SWA up for out and down for in, try setting NOR to -10%, REV to 100% and OFFSET to 0%