thanks a lot so far! The plugin I personally find most useful is the "Admin Menu Editor" (http://wordpress.org/plugins/admin-menu-editor/).
In the meantime, it seems that I’ve learned that all toplevel page item are not allowed to be "managed away" in WordPress – they recreate themselves everytime.
It is only possible (1) to create a top level menu item by hand or (2) to create a sub menu item or (3) to delete, = "manage away", a sub menu item. It is not possible to "manage away" a menu item that is registered as a toplevel page in the code.
At least not with "Admin Menu Editor" – but I dare to say, that it is not possible with any of these menu plugins, because it’s a WordPress standard.
So there we have it: another reason why I don’t like plugins that create toplevel menu items. ^^ There are a lot of them out there which act like that. Most of the time it is totally unneccessary to have them as a toplevel menu item, because the provided functionality isn’t that crucial to have it "always available for blitz access".
Ultimate TinyMCE is one of them. So I encourage you, for the sake of usability, not to define it as a toplevel menu item, but leave it where it belongs and where it was ever since: as a settings submenu.
Also a thing I noticed so far: some toplevel menu items are sometimes hard to manage in dependency of the user role/right. They act a bit quirky, I don’t know why yet. And as I see it, it is crucial for site managers to keep the admin menu lean for lower user roles. They must not have access to some menu items. We need to be able to "manage them away" under all circumstances; or sooner or later crap will happen because of this – we all know how the cookie crumbles with customers or just "users" some times … Don’t give them too much possibilities. ;)