Not sure if anyone has already mentioned this, but how about the ability to set your retainer to a specified action. Something such as tending to your garden or chocobo stable or maybe even the ability to sit down or interact with the Striking Dummy. It makes them look a bit more lively and not just a simple garden gnome. I know it's a bit far-fetched and could cause some issues with server loading and what not, but would be nice if it's something that could come somewhere in the long run.

Also how about the ability to let other people see your retainer's name.