Variable Number limits

As a Mabl user I would like to just use a random number.

Currently mabl has a string variable template that can pick a number with you use digit. The problem with this is if I want 0-100 I can't use digit:3 I have to use digit:2. The same goes for if I want 1-20 I have to use digit:20 but there is no way to limit it inside of mabl's default variables. I have to use javascript. I would like to be able to put a max and min on digit string variable. Similar to the upper and lower for alphas. This would allow me to create a number between 5- 40 and not have to worry creating another javascript snippet of code. I am up to 7 pages or more and keeping the names separate is getting harder.