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Either do I, and there are few people here, if any at all, who have ported it over into xoops. The ability is here in the community, but the time and dedication it would take is rather large.
The easiest fix I found when I did try out the phppp for XOOPS version, was that after I installed it, I remember modifying the templates fro the phpbb so that it didn't mess up my XOOPS .css
It took a lot of work and experiementation. Hours of trial and error and most of which I can't even remember anymore.
I did the same thing with the IPB mod, but that was even more complex because it's theme system. My major gripe with both is the modifications to core file which broke my instalation when I uninstalled them.
Newbb is not yet mature enough and other systems still need work. So for me, the decision to go without forums is a painfull one. I'm still hopeing a suitble solution presents itself one day.
I wish I could help you out, but I lack the skills neccesary to port pnphpbb to the X system. My suggestion, although weak as it seems, is to wait for the X2.1 version. The roadmap for X2.2 is also in the works, so that only means that there will always be room for improvement.
I for one, am willing to wait it out.
Cheers