The "command-x" menu items are for all any Buddy List(s) you may
already have. They appear in the Window menu. However, if you have
no Buddy List, there will be
nothing to display and command-1 will do nothing (almost, anyway). See the examples below.
[attachment=2690:Buddy_Li..._had_any.gif]
Various command plus a number selects each type of Buddy List.
[attachment=2691:Buddy_Li...have_any.gif]
If you have no Buddy List, there's
no action for a 'command-1, 2,3,4,5,6,7,8 or 9.'
So all you'll get is a System beep.
The problem is that any 'Buddy List' I or my wife might have had is long lost. There is no way in Contacts, the logical place, IMHO, to mark/add them as a Buddy.
Further, the term
iMessages is still in use, apparently to iDentify a Message sent from/to iDevices but
not a Mac? Why? It would seem the whole point of 'unifying' "messaging" was to eliminate the multiple types of messages for different types of devices.
And I'm not the only one discouraged/confused/dissatisfied with this change from one app to two that still don't make it as easy as it had been. Just Google "missing Buddy Lists" and see for your self. I think this comment about sums it up for me: "The buddy list is still there. Use option + 1. Its one more thing they fixed that wasn't broken and its one more apple app I'm no longer going to use. I've switched to Adium."
I suspect I'll continue not using Messages, since I've not seen a need for several years... emails still work, are available on any email app (desktop/portable/mobile) and are non-intrusive.