Know something I don't? I suppose you could be talking about inviting someone to your group, setting them as focus, then disbanding. This will keep that focus until it gets unset, whereupon you must reset it to someone in group/raid again. But that makes it useless for people using dynamic focus for leaders.
well I was thinking the same thing as Ugh - and using the same type of macro as evidence... until someone on vent pointed out (rather condescendingly) that you can focus via right-click unit frame pretty much all the time.

so clarification: setting focus via macro when not grouped doesn't seem to work with the examples above(which is how i'd been setting those macros up as well). I'd bet if you changed those to something with a /target line it it they'd work out of group?

/target ukobach
/focus
/target focus

edit #2 - of course that works and now my coffee is kicking in