Idea
Having a remote gui / client application on a notebook to control a madmapper instance running on a master machine
I think everybody knows the problem messing around with long cables, video transmitters or remote software for setting up a mapping where you have sit right in front of the mapping but all projectors are far away.
Windows remote desktop is quick, for free, but does not allow controlling external monitors.
TeamViewer or VNC usually is the way to go but brings its quirks.
So you would have to setup the outputs on the master machine.
Then you could use a lightweight computer connected via wifi to setup everything while walking around.