Custom features for GPU-based Onion Hash Generator

I need you to modify software called Scallion. This software uses GPUs to create vanity GPG keys and .onion addresses. ( for TOR Hidden Services). I would like to add better performance, better user interface and ease of installation ( currently different versions of windows have system files missing. would like them added into the program. Also would like the software to use multi GPUs in one instance of the software. so that all the GPUs are working as one. Currently i have to open a new command window to use a second GPU and so on. please review Scallion open source software on GITHUB [login to view URL]