as I'm often reading the forums via WAP2 on my mobile: as long as "show unread posts" doesn't exist for the wap2 layout, having to click through even more forums just to see if there's anything new in them is a pain - which is why I voted 'no'.
*please* don't add subcategories. I wouldn't even know where to place specific addons, as more than one category might be valid - and as not all brains work the same, someone would definetly search for addon A in category X instead of category Y where the developer put it.
Also it's not really easy to see what has recently changed without being logged in, without clicking through a dozen additional forums.
I can do the subcats, however tagging labels like gmail does is beyond SMF I think.really I'd like to setup a community in django, but I'm neither have the time, nor am I good enough to do it quickly in django, nor is it installed on the box atm. Although the last is probably the easiest to fix. I'm going to review the Ace2 categories so that we can have some kinda stucture to go by and then make sub forums for each category.
i think you should have catories based on the ace2 categories. one of the knocks against wowace.com forums is that it's nearly impossible to follow what is going on. splitting the addon threads up by addon category and a little moderation to keep things tidey will go a long way! :)