@Tom - Sorry for bringing Redscape up. I certainly did not mean to be scolding towards it, although looking back at my post I probably was. It's very interesting that it had 200 players at one point - I thought it had always been a small community. How did it lose so many members?
Also, your point that this variant may help cheaters is valid, but that really isn't a great reason to remove it. The reason why is that exactly the same argument could be applied to a lot of variants:
"Gunboat gives cheaters a much larger advantage over other players than they would have in a FP game. Some people like the Gunboat option, but is it really worth having the increased risk of cheating? We should disable it to stop this, and give mods the power to turn this variant on SRGs only if it's needed. It stops most people from using the option regularly, yes, but it also reduces the possibility of cheating."
That template is a fairly good summation of the argument, and can easily be applied to many other things:
"Public Press Only gives cheaters a much larger advantage over other players than they would have in a FP game. Some people like the PPO option, but is it really worth having the increased risk of cheating? We should disable it to stop this, and give mods the power to turn this variant on in SRGs only if it's needed. It stops most people from using the option regularly, yes, but it also reduces the possibility of cheating."
Or even:
"Smaller variants give cheaters a much larger advantage over other players than they would have in a larger game. Some people like the option to play with less players, but is it really worth having the increased risk of cheating? We should disable any variants with 5 players or less to stop this, and give mods the power to turn these variants on in SRGs only if they're needed. It stops most people from using the option regularly, yes, but it also reduces the possibility of cheating."
-Also, for that one, why just <5 player variants? Two cheaters can have a huge effect in anything up to 8 or 9. Standard could be disabled under the same logic.
You could use this template to argue against the vast majority of variants. In fact, you could use it to argue against a site that runs like this altogether:
"Having only a couple of Mods to watch over 200ish games gives cheaters a much larger advantage over other players than they would have on a site that had an individual mod for each game. It would take a lot more effort, but is it really worth having the increased risk of cheating? We should have an individual GM for every game. It will vastly reduce the number of games that are able to be played at any point due to the limited number of GMs, but it also reduces the possibility of cheating."
And taking it to the most extreme it could possibly be:
"The ability to play Diplomacy at all gives cheaters the ability to cheat. Some people like to play the game, but is it really worth having the risk of cheating? We should completely stop everyone from playing the game altogether. It may stop people playing the game they want to play, but it also stops the possibility of cheating."
The later arguments here are completely ridiculous, and that's obvious for anyone to see. The first ones (against CYOC, Gunboat, and PPO) are not so ridiculous and could be argued for with credibility. However, the same argument could be used for everything. The real problem here is that, with a greater range of variants, you are inevitably going to have some that have an increased risk of cheating. Where do you draw the line? If CYOC is disabled Gunboat certainly needs to be, as Gunboat has a much bigger risk of cheating and impact of cheating, and I think most players would agree that gunboat should not be disabled (even those who don't like it), because a considerable number of players enjoy the variant.
Anyhow, I've rattled on for far too long. My point is that, if you're not willing to take the risk of cheating, draw your own line and don't play the variant. Many people have done so with Gunboat already, and this method has the bonus that people who like the variant are still able to play it, while people who don't like it don't need to play it. It's the best compromise by a long way.
Just as a quick final note - if any multis are reading this, try Orathaic's variant rather than any of the ones here. It's custom made to be the best variant for cheating in out there:
http://www.maths.tcd.ie/~orathaic/multiswebdip/