Prevent round from starting in MM

[bianster]

I've looked through the DLL/Engine notes for MM and it's not clear to me how I would code my MM plugin to prevent rounds from starting.

In my case, all connecting clients are placed on spectators and I want the hlds instance to be long lived by not having rounds end at all.

Do I need to be hooking into system events and superceding the ones related to rounds starting?