The problem is more that RoamingOrb (or the Dianemo iOS app) displays nothing at all; they won't load any screens if a "modal" type dialog is on the regular orbiters. You launch the app and it spins away doing nothing. Attempting to log into the web orbiter does the same thing; there is no orbiter UI. This could lead the user to believe that the "system" is broken if they don't have a regular orbiter to see the message on. There might be a reason for this behaviour, in which case something should be done on the WebOrbiter or WebAdmin to allow the user to understand that their input/action is required. If there isn't a reason for this behaviour, then I guess a bug would need to be filed.
Don't know for sure, but it might relate to an existing bug: http://svn.linuxmce.org/trac.cgi/ticket/548
My concern is for the End-user experience for those who might have a core, uPnP boxes only for media, and iDevices for controlling it, which could be a use-case for people just getting into LMCE with entry level or existing hardware.
Thanks for your time!