[The DX5e has a fixed expo function, about 20% or so. To enable it, hold right aileron trim and then turn on the transmitter. You'll hear a series of ascending tones. To disable it, hold left aileron trim and turn it on. You'll hear a series of descending tones indicating that it's off.]
Now this boggles my mind... When performing a normal bind to the a/c, i can toggle my rate switch lo to hi and tell a difference in flight control travel. Now where does this 20% turning it on come into play? Would it be 20% more than the already "hi".