Totally agree. The router is kind of locked. Can only do Samba or FTP AFAIK.
But even with your very well described caveats maybe I'll just see between the 900 Mbit/s of the link speed and the measly 54 Mbps of the network utility which is closer (and believe I already know that Network Utility is totally useless). Thank you
Good luck. If your network really is running at 54Mb/s you shouldn't be seeing much more than 20Mb/s or so (2.5MB/s).