Currently No we do not support that software.
From my personal observations it has one major drawback that would keep us from supporting it. Currently XMB has no user definable cookie settings. Right now the cookies seem hard coded to the current directory XMB is installed in. To be compatible XMB would have to have cookies set site wide / . In fact most any forum like UBBThreads for example where the cookie path is not definable in the admin section or config the software developers had the common sense to set the cookie site wide. Until XMB either makes cookie settings an admin option or hard codes the cookie path site wide we could not even begin to think about supporting integration with that forum.
I did up a test integration with that forum here
You can login as user test and password testing
You will see your logged in also at the forum here
However if log out of the gallery and login to the forum you will see that your not logged into the gallery
reason being the problem with xmb cookie settings. Your cookie path in the cookie is this /xmbforum/ instead of /