The Cougar now allows a mix of analogue and digital input to an axis. I used the following lines:
in my .tmm macro file I had WEP = /P p /R p
and in my .tmj joystick file I had THR 5 1 (97 100) WEP
Using that the throttle was still putting 100% throttle into AH but at 97% of its travel, past that WEP would come in. I preferred a button but I suppose if you wanted to play about with detents you could set it up pretty good, I just could'nt be bothered and it was hassle to find the last few % of the throttle travel to get 100% throttle without the detent there.