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Good ideas Wizanda, but I see some problems with your organisation.
1) There are hundreds of modules outta there!
2) Not all module developpers are willing to discuss about their modules here. Most of them in fact are solo workers whos just develop their applications for themselves, and as reward to the XOOPS community, allow others to use it freely.
3) Creating one forum for each and every module represents a heavy duty. Too much to deal with for too few persons. A few time ago, the forums of frxoops (french speaking support site) was design that way, with category forums (content modules, agenda modules, picture modules, etc.)... and at the end of the day, it was just a big mess, with nothing clear for noone. We have recently deleted all those forums, and just created a "module support" forums.
To make a long story, short, it doesn't work.