I already petitioned gamemaker-games and they were against the idea of scripting it unfortunately. Ive included a module script for reference on the ports page of the wiki for those who want to do it manually.
Perhaps webfoot games would be more amicable to the idea of including it in the retropie script. (20000+ users with access to their games doesn’t sound like a bad proposition to me)
A list of games would be a good idea. Most of the problems with pi based games seems to be they either need X or a keyboard and mouse.
It would be cool to make a pi based game menu for things like webfoot games and apt-games. But I doubt we will get to anything like that anytime soon as there are other priorities at the moment. It also depends on distribution rights etc.