[@Mahz]I expressed this opinion elsewhere, but one of the main things that drew me to the site was that there was an obvious section for different levels of dedication. If everything was lumped together, it would have been much less obvious, and I may not have joined.

One suggestion (probably slightly more difficult to manage) is to maintain the different forums (Free, Casual, etc), but have an indepth search feature that allows you to search threads by tags like you listed above. Another option is to let people post IntChecks and RPs, and the same thread shows up (or is linked) in each forum that shares a specific tag (no idea on how hard that is to code). A third idea is to mix all the Interest Checks together and let people filter by tags, but leave the RPs themselves separated out once the level of commitment is decided (not sure how I feel on that idea, as it simply makes it harder to find things in my opinion).