Hey,
This thread helped me out a lot and I was able to get the stylus working completely.
To get the clicking, you need to change some of the source code.
grab the fpit module code from
xorg and edit xf86Fpit.c
comment out line 285 which looks like:
if (!prox) buttons=0;
Compile it and install it and the clicking should work now.
Good luck,
Sthitha