Thanks to Sub Zero i've been able to compile and to test a full working version for FW 1.5 :)
Taking into account the good advice of LNAtropic, the key mapping has been changed and it's now much more confortable :D
If you want a binary version with only needed files, try this link :
PSPX48 v1.0.1
For binary and sources, take the link below ...
Edit: Those zip files contains now directory for 1.5 and 2.x FW (thanks to WebCousin)