I'm not technically inclined enough to describe this mechanically, but I can describe what I'd like to see implemented;
A menu which lets you create your own dice, kind of like making a deck of cards. It should let you determine # of sides, and then either a numerical value and/or an image for each side. Finally, a checkbox for explosion or other features.
This will cover things like dicepool systems, FATE dice, a variety of homebrew systems, the new The One Ring dice, and others, without putting the onus on you guys to hard-code each one.
We can already approximate this with the deck system, it'd just be an improvement if it were in the chat box and the sum of the numerical values appeared plus the images rolled.