So,Andrew,a smart and powerful auto-simplify retopo tool is very important for "voxel to polygon" workflow,the auto-simplify retopo tool worth you spend a week on it!
Keeping in mind that this is an alpha (not even beta yet). The functionality you need may not be implemented yet even if you do get an extension. I believe Andrew is looking at a release in December, though I'm sure nothing is set in stone. So it could be 2 months or more before what you need is available.