Very Nice ... would be better with more settings – FlashMath (math flash cards) Review

This program is exactly what my 2nd Grade son needs but additional settings are required to be 100% useful. He needs to be able to add and subract the numbers 0 through 20 quickly for school. Unfortanately this program only allows setting numbers by total digits. I would love to see an upgrade that also lets you set the range (0 through 20 in our case) and also allows you to turn OFF negative number answers since that is not taught in the lower grades. Thanks and look forward to an update. Perhaps using the scroll wheel interface could be used to set the max and min numbers used in the problems.
Review by dmhines on FlashMath (math flash cards).