I'm currently allowing both original disc runs and runs from HDD (on modded consoles) for this game. Some initial evaluation suggests that load times are not considerably improved when running from HDD, and Xbox disc drives aren't going to last forever. I do want to require submissions to declare which they're on, in case we need to split disc vs. installed in the future.
Emulator runs are currently not allowed, but if an Xbox emulator manages to get to the point where it can acceptably run this game I'm willing to reevaluate this rule.
It's been a few years, and xemu is compatible and it seems to run pretty well, so I have enabled emulator submissions.
(At some point we may need to split console/disc vs console/hdd vs emulator onto different boards due to load time differences or otherwise do some load-time removal, since xemu doesn't seem to emulate disc read times. Given how few runs we currently have, I'm filing this under 'for later consideration'.)