Version: (using KDE 3.5.9) Such entries like switch user or switch session are hardcoded. Please give access to them, so the user could move them,copy them, etc.
They are not .desktop files. This would be a massive PITA to support and would require a rewrite of the menus. I'm sure there are plasma wishlists requesting this ability, join one of those, eg 202795.
I don't see here big issue -- there are other parts which are not .desktop files as well (favourites, latest, etc.) and they can be hidden/shown. It is only a flag -- "show in the menu" (or hide from...). While displaying the menu the entries are filtered -- no danger here. Please reconsider and reopen this report -- excluding mentioned entries is really helpful for not experienced users.
There's no way for KMenuEdit to easily get at these non-desktop-file items, since they are added to the tree of desktop-file items by the application launchers as they build the menu widgets to show, and are not configurable in a common way. So this wishlist would require a rewrite of the app launchers to do everything via .desktop files or some other common mechanism.
Ok, maybe it is not JJ :-) but do the possible problems justify a wontfix? After all, maybe somebody will be interested in doing this, wontfix will filter out this report.