We have these setup in a way which is pretty flexible so you could mix the leaderboards if you wanted. Basically you could copy/paste code from both onto a new page & update links to the newly created archives page (in the 'promotions > descriptions' files). It actually might make sense for us to switch to this way of doing it if there's enough interest.
In order to to keep the flexibility, I think it's best to keep the leaderboard includes separate. If we output all leaderboards for a room into 1 token then there would be an issue if a publisher wanted to separate them. Also, they would have to be totally recoded since those Race/Chase includes contain links to pages with a lot of dynamic leaderboard logic within them. I'm not even sure this way is possible/feasible.
Mark
PAS Design Department