There is now a very, very basic dice roller available: it's the third icon in the icon bar above the smilies when posting.
It automatically creates
[roll][/roll]
tags, which could be filled as follows:
[roll]2d6[/roll] - Roll 2 6-sided dices and sum up the results
[blockquote]Rolled 2d6 : 2, 6, total 8[/blockquote]
[roll]1d20[/roll] - Roll 1 20-sided dice and publish the result
[blockquote]Rolled 1d20 : 14, total 14[/blockquote]
As far as I have seen, there is no convenient way to make this more cheat-proof and in all honesty, I don't see anyone on the team spending larger amounts of time on this either so, for now, please just tell me whether you'd like to give this a try or not.