So, on the recode, something big we're working on is remote missions. Remote missions are going to provide the foundations for more complex and interactive missions on HackThisSite. We can share missions with other war-gaming sites, easily put up virtual machine missions, and allow our users to put up their own missions that might not be compatible with our current system. All of this is far faster and allows much more control than is currently possible.
Something I would like to say though, is that right now remote missions are an extremely tentative proof-of-concept. The current code was also designed with realistic missions in mind. Naturally, it will be much more streamlined in the recode.
If you would like to contact us about having your own mission put up, you can contact me at staff@hackthissite.org or as bren2010 on HackThisSite's IRC. (IRC is preferred) One caveat we should point out though: due to the beta nature of this, only missions we can verify the integrity of will accepted. Users should be able to host the mission independently 24/7 for extended periods of time.
Anyways, have fun with the first mission!
Remote Mission - Beta 1
The remote mission API can be found at: http://pastebin.com/YtmkepUU