Dice engine addition

I'd like to be able to define the ranges for what makes a dice highlighted in color in inline rolls. For example, currently [[1d20+7]] will be highlighted red at 8 (roll of 1) and highlighted a different color at 27 (roll of 20). I'd like to be able to do, for example, [[1d20t19 + 7]] and have that make 19 or 20 (on the die) highlight, or [[1d20f2+7]] and have that highlight 1 or 2. Don't care much about syntax (it'd be *neat* to define ranges like t13-15 but I worry about order of operations), or what letter is chosen. Just want to do it. My specific use is threat ranges in d20 systems, but could be useful in others as well...

Actually, I'd like this for all rolls - crit ranges in the chat message work but are ugly.

I agree with this idea. Also, is there a way of putting a comment in that only appears under certain circumstances such as 'Critical Failure!' in the case of rolling 1 on a d20, or 'snake eyes' on 2d6? I would also like to be able to use an 'explode' function referencing either a total rolled in more than one die, so for example, 'roll 2d6. If they total 12, roll another d6 and add it on.' OR 'roll 2d6, if BOTH dice come up as 6, roll another d6 and add it on'. This 'explosion' method is used by Decipher's Star Trek RPG and also by my group as a house rule for BESM. On 'boxcars', ie 12 on 2d6, you roll another d6 and add it to your total. If you happen to roll another 6 you roll ANOTHER d6 and so on. (And you're a jammy so-and-so, but that's another story!).