I resigned to use it again, but I can't put it to work the way I want.
With a default settings, things are almost great : newer games works fine with the stick config on LS. No remanence input created by the way the stick don't reset to neutral position instantly.
But in older games (only tried in th08), the remanence is here.
The best fix I think about is to force touhou to recognize the POV input and not the axis x&y, but I can't find a way to do that ... if I change the leftstick to input POV in xbcd, it's doesn't work.
It's late, so I'm tired and I might miss something ...
edit: like usual, I find a way just after posting somewhere. Configuring dpad on axis x&y might works fine.