(Eugene, check me on this ... )
First of all, it's not a matter of stupidity at all! Network communication protocols make for a fairly complex topic.
As I understand it, RAdmin uses a proprietary communication protocol (and possibly proprietary encryption as well) . So for ANY client to be able to communicate with a RAdmin server, that client has to "speak the same language". (Just pointing a SSH client at port 4899 instead of 22 won't work.)
So until Famatech (or some really brave an enterprising third party programmer) writes a client that will run on a mobile platform (iPhone, Windows Mobile, whatever), we're out of luck.