To be able to assign your own screenshot shortcut keys. More specifically, selecting your own key combinations.
I work on a mac and a PC through a Mac keyboard and a KVM. My keyboard does not have a print screen button (nor equivalent) so I can not use shortcuts with your software. I know the "simple" solution is to ket a PC keyboard, but I hate the way they feel. I have used several after-market keyboards and have not found one that has all the functions I need for the Mac and still lets me do what I need on my PC.
I feel this probably sounds easier than it is. There are several Mac programs that allow you to create your own modifier shortcuts - usually insisting that you use CMD or Option keys (Windows or Alt respectively) and then any other key you like.
This would make it more flexible. Please consider it if it is possible.