Well, I linked that as an example, more as a reference for someone who is willing to code it.
As for the cheating thing, I concur, but as far I saw on other forums where they use dice roll, if your post where you used dice roll is edited, they don't take it as a valid roll.
With some rules like that, even if the code is imperfect, it would be possible to have control over the rolled results.

Btw, there is a dice roll plugin for vbuletin, if that's what this forum use. Here it is:

http://www.vbulletin.org/forum/showthread.php?t=113972

As for moderating dice rolls, I guess if the ppl would start opening events, board games or post-to-play RPGs it would include the whole new sub-forum so it would probably have it's own moderators that would be assigned to check for inconsistencies.

Or, if used on official GM events, every GM that is also a mod is always checking what is going on anyway on that part of the forum.
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Here is just one example of it's many use for board games:

I draw a board with fields and pathways and mark some of them with events like: If you stand on this field you go 3 spaces backward, or if you stand on this field you have to fight GM and defeat him in game in some aikido mod, or something like that, etc

Objective could be to race other players to finish of that board game. We set some prizes, people apply and then they just roll dice while I set graphically their icons that represent them on the fields. We just play some basic board game with some events specified when they stand on some fields, etc.

If the board is set on the official event page, we just set the rule that if you edit your post with the dice roll you are disqualified from the game, same thing if mod notices that you have deleted your post with the dice roll an set another instead of that.
Not really the problem nor too much fuss.