Critical Hit bonus Die

Is there currently support in macros (or in dice rolling in general) for an extra die of a different kind on a max roll? I know there's exploding dice of the same kind (a 6 on a d6 give you another d6), but I'm looking for something like rolling a d20 on the 20 before modifiers and adding 1d6.

I.E. 1d6 bonus damage on a magical weapon in 4e due to a natural crit.

Hi Joshua Currently, there's no mechanic in place that would satisfy your request automatically, but I encourage you to add it to the big'ol Dice suggestion thread, where we aggregate all the different mechanic suggestions. <a href="http://community.roll20.net/discussion/208/dice-rolling-suggestions" rel="nofollow">http://community.roll20.net/discussion/208/dice-rolling-suggestions</a> Thanks!