In Unity, the menu bar for most applications appears on the top panel, on mouse-over. Additionally, one can use the keyboard to quickly access menu items by pressing alt and typing what you're looking for.
The mouse-over menu, however, hides some items. Is there any way to get these to be shown, all the time? (Is this bug?)
The only example I know of (and they're hard to discover, because you can't enumerate choices from the alt finder, and you can't easily see what's missing from the menu itself) is the entire "Format" menu in Thunderbird. It resides under Options → Format, or so claims the alt finder.
Note that this question pertains to the items within the menu not the menu bar itself; specifically, this is not the same question as "Can auto-hide for the application menu be turned off in Unity?" which is referring to the bar as a whole and not items within it — the answer there is unrelated to this question. I don't wish to enable/disable auto-hiding of the entire bar, rather, I seek to know why some items (such as the aforementioned Options → Format) do not appear in the menu.