What, if we could have three tabs at the top of all three preferences pages? I mean "preferences", "customize" & "file types". I guess, almost everyone here had this a countless times, wanting to open some of the options, but "oh, wait, that was in "file types".
So, once one of the options was opened, but the wrong one, we could directly change to the right department, just using the right tab. This would be maybe an alternative to having all three option menues in one big menu.