High Variance Dice - How would you make these?

Hey folks,  Wyrmwood recently launched their dice Kickstarter and one of the options is a high variance dice. The idea is that you have the same chance of success and failure, but the impact of those successes and failures are larger (critical). I really like the intent and idea of this.  How would you add this as an option into Roll20? I'd imagine this would be an API script change or something similar. Love to know your thoughts or suggestions. Thanks

You'd set each one up as a rollable table with the appropriate weighting for each result. Then you'd roll them with something like [[ 1t[altd20] ]] etc

Thanks, Ziechael! I'll try this out. 

If this works could you please send me the code of how to make this work? I've just backed that kickstarter just to get one of those dice :P