@V0RT3X666 A lot of sites have domain.com/username ... Facebook, twitter, Instagram the list goes on, I would say that is industry standard.
Phpfox is another example of community software that has /username
If its not possible with IPS its not possible with IPS, I will need to rethink if to proceed with my project or look at other software which of course i do not want to do as i ve used IPS for many years on another successful project and think its far superior than its competitors.
I would say its not possible seeing you guys are very experienced plugin developers here, dispite IPS support saying it is possible with some customisation and sending me to these forums.
My idea however and the domain wont be anywhere near as good without /username so a rethink is due.
Thank you everyone for your responses.