Hello.
What do you think about the following: we could add a new optional field (i.e. it can be NULL) of type "LANG_ID" to the "menu entry" structure. Then, if the user is in the menu and presses a special key (e.g. "long select"), then a popup text would be displayed explaining what the menu item does.
I know that in the root menu that key brings up the item's context menu and that in the lists of values the long select sets the cursor to the default value. In these cases, the key would do nothing. But it's arguable that these cases do not need any explanation at all. For other items, that could be handy.