I just took a look around on the GMC and it looks like there are no "true fullscreen" extensions for GM7-8.1. I think Studio may support it but unfortunately RoR isn't programmed in Studio.
This could be due to GMC's "no harmful extensions" rule which discourages GameMaker programmers from publishing anything that mucks around with your computer. (for example, communicating with a website not originally developed for that purpose, hiding tray icons, keylogging, shutting down/logging off, etc)
The developers will need to turn to other places in the game where they can optimize the graphics for lower end pc users.
Last edited: Jan 26, 2014