I've mentioned this before. ATM MOS and AROS come under "alternative systems", but I think of Windows, MacOS and Linux more as alternatives, and MOS and AROS as compatibles.
The problem is this though, aside from Talk-about which is hidden from the front page, there lacks any distiction between different froums threads are in on the front page and on the "latest threads" page while the forums are displayed, it's usually the subjects I go by.
While adding new forums will keep things neater and better organised, it's not going to stop people trolling, and flaming. You'd need an industrial size dose of growing up for that.