How about a little hand-held box with a touch-screen and ethernet port for network testing? Test/display DHCP, PPPOE, etc., along with basic MII info and stats? Bandwidth test? POE testing/info? Really it'd just be stuffing a ROS router into an appropriate box with a battery, and some UI work for the touch screen.
Haven't seen the combination of good and cheap in this space that Mikrotik usually hits.