Ah, yes, i was being a dumb arse, i wasnt pressing the + to add to the list :O)

However, now i've worked that out, i've tried mapping "XBUTTON2" to "2" and thats not worked for me...However! I have managed to map "XBUTTON1" to "2" and that seems to be working fine, its passing through "2" to my main character and my followers.

The mouse is a MS Habu, i've not installed the s/w that came with it as it shafted the rest of my UBS ports, might be time to check for new drivers

Thx for input guys.