If it's there for the taking, you will see it in the UI.
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I have some bad news though...
The DUI Oblivion way of doing in-game settings won't work with F3. The HUD doesn't appear to update it's controls while the game is in an another menumode. The only way I've been able to make it work, is by activating the console, which is a semi-menumode I suppose. With FOSE there won't be any issues of course.
In short, there might be a FOSE requirement for in-game settings to work at all. Still investigating though.