2 most useful bits of info

[maxrealism]

"C:\Program Files\Doom 3\doom3.exe" +set com_allowConsole 1

Allows the console to be brought down using the ` key.
com_showfps 1 (on the console) brings up the fps counter.

http://ucguides.savagehelp.com/Doom3/fullcmdlist.htm

http://doom3.filefront.com/news/Total_and_Complete_Command_List;12085

Both worth a look if you're hunting for that elusive console command.

[Optimus]

you obviously didn't read one of the first lines on the Doom 3 readme...

the console is ALWAYS accessible, you just have to press Ctrl-Shift-` rather than just `...

sure, entering the code in makes life easier, but its an extra step by itself...

[maxrealism]

Originally posted by Optimus
you obviously didn't read one of the first lines on the Doom 3 readme...

you're right I don't read readme files or manuals. I did know that keyboard hotkey - which sucks.

[Ratty]

OR you can just go into your cfg file and add a 1 there and while your at it, add nightmare mode too....(you can look for that one yourself)