One of the things I liked about the 'old' Tremulous forums were how broad its sections were. I suppose you have made a good choice in expanding the topics into subtopics, but if you look at other forums which do similar things, you realize that subtopics frequently get ignored, unless heavily moderated (so that posts which belong in a subforum end up there). An example is any clan forum ever (which has more than the basic boards), which has several completely unused boards. Being a well-populated forum, the Tremulous forum will probably do fine with all these subtopics, but it's still annoying for the people that go down through the list of topics instead of just 'showing unread posts'.
TL;dr version:
Is too many subtopics a good thing?