This program will let you edit the Oblivion.ini file with ease. You can also make backups and restores so you can experiment easily (the backup is a XML file). It also has a description for some key fields explaining what they do. You can add new descriptions by right-clicking an item and selecting "Set Key Description". Now the interface files can be edited too as long as they are *valid* XML. Those who make interface mods could make a configuration file to edit the interface too.