I no longer have the source code GEDS though. Try these settings in wine, it works for me and another user http://wiki.winehq.org/UsefulRegistryKeys Also try setting the "Virtual Desktop" to on. That'd be more like su -c ...
Games work fine in Linux if you use WINE but if the game is fullscreen it won't work. (well it does not for me) The solution is simple... just open Game Editor and click game properties... set the fullscreen option to window mode. Then export a Windows ...
I'm terribly sorry I dont have the GEDS anymore :( Can you try using WINE? sudo apt-get install wine if not, then try using VirtualBox and installing Windows XP on it :) That'd be more like su -c 'smart install wine' for me, I run Unity ...