Could we do it? Sure, we could. But, in order to do it, it would require a TON of time, and it would (likely) require us to significantly change our internal processes and how we do business. To be frank, spending that kind of time with AVWW right now is probably not in our best interest as a company, especially for something that isn't likely to drive sales all that well.
If the game had sold 15 million copies like Minecraft did, then we might consider something like this, if enough folks wanted it. But, as it stands now, there's not a large community push for moddibility, and even if there were, it's not all that feasible with sales numbers like they are.