First off, just to re-iterate: the mod was not created with Surround/Eyefinity support in mind. The fact that it works to any degree at all is a (pleasant) surprise. I know Eyefinity is mentioned on the main page of this site, but the mod doesn't officially support it. Perhaps in the next version I can try and improve multi-monitor support.
Second, the pvmodelfov and pvmodelaspect commands are unnecessary. They were not used in the mod at all. Frankly, they could be considered useless for the purpose of implementing widescreen.
It's possible that the reason your changes are not sticking, is because you are not running the game with Administrator privileges in Vista/7. You might need to right click the Tron 2.0 shortcut, go to the Compatibility tab, and put a checkmark in the "Run this program as an administrator" box.
Haha, you're probably right. I'm a Linux guy so I hate running things as root unless it's necessary. I just switched from Project64 1.7 to 1.6 and threw it in the Program Files folder. But I have to run the program as administrator for it to modify any of the save files, despite me adding full control to user, admin, and everyone else on the list. Turning off read-only justs causes it to turn back on again. It's a nightmare! Windows 7 broke so many things. But admittedly, it fixed many others.