ive always been under the impression that staff nationalities mean diddley squat.
im sure this was asked previously, but i really cant be sure. If i find the thread ill link to it. Im assuming that because you cannot search for staff members based on nationality, that it means nothing.
Perhaps this could be a suggestion for game improvement? It would also encourage teams to have more local players as well. No point in having a, in my example, an Aussie staff member, if half my team are spanish, or greek or whatever.