I have a Thrustmaster T.16000M and I am quite sure you can adjust about ANYTHING with TARGET, I do it too!
All you would need to do is set deadzones (say, 15) on both, the lower and upper of a particular axis, the curve will become steeper and the axis more sensitive because it will reach 100% earlier. It works fine here.
What exactly does not work?
Read my TARGET mini guide here:
http://forums.frontier.co.uk/showthread.php?t=33932
You might ignore the part where I add lines to get the POV/HAT to work, depending what OS you use and of course your stick. But the principle should be the same for Warthog as well. You can really change/do anything with those sticks and TARGET short of making the sticks lay eggs

It's a little confusing at first but then it really adds to the thrustmaster sticks if you know how to do it.