Forts: Is that because people don't play forts any more, or because mapgen forts arent good enough? I am guessing its a combination of both.
Boomrace: There are issues with this. Creating a race is difficult. Really, really difficult. But the real problem is that proving it to be completable is impossible. If i was to try it, about the only way it would work would be by combining known completable takes together, which doesn't sound very fun to me. Somewhat depends on the number of tiles available.