I'm not enthusiastic about using IRC, but if we're going to use IRC at all, it should probably be option 3. Changing things mid-mission would only cause chaos.
As for the setting it up, I would say that we should recommend using Chatzilla and put a little tutorial for how to set it up. A lot of the IRC programs have all sorts of shitware to trap newbies - Firefox gives no troubles and for something like mission running Chatzilla suffices plenty. It also has the advantage that the mod can just toss an irc:// link to the chatroom and chatzilla auto-opens it on click, no need to go around doing /join and stuff.
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As for the setting it up, I would say that we should recommend using Chatzilla and put a little tutorial for how to set it up. A lot of the IRC programs have all sorts of shitware to trap newbies - Firefox gives no troubles and for something like mission running Chatzilla suffices plenty. It also has the advantage that the mod can just toss an irc:// link to the chatroom and chatzilla auto-opens it on click, no need to go around doing /join and stuff.