If PJLink does not make it into mad mapper or if you need solutions faster, I've been exploring PJLink solutions to try and automate some things on a current show. I've found two useful external utilities that can link PJLink commands to OSC commands for automation.
Luminosus is geared to working with ETC EOS lighting consoles, but it is not limited to them. The interface is node based and it can have OSC, Midi, and sACD dmx listeners to automate a number of actions including PJ Link. I use it on a number of projects involving OSC
Bitfocus Companion is more like macro scripting, and is designed to be use in conjunction with an Elgato Streamdeck Macro pad. Even if you don't have a stream deck, you can trigger Companion macros via OSC. Companion also has support for controlling Mad Mapper.
Hope this helps your projects.