poVoq First of all, it seems to be something people want(i would like to see that too). And second, with the way Flarum presents it, it wouldn't really make a difference imho. Like you see all threads, no matter what tag, as default view. Before you see the subtags in the sidepanel you have to click on the parent tag, where you see all threads from that parent tag, no matter what child tag. You could basically have the same structure, but an interface, where its easier to see all discussions, no matter what category they are in. So the only difference to few top level tags would be, that you can sort threads easier. The rest would be the same, as flarum goes the other way round to showing you the forums activity compared to phpbb.