That doesnt even work when having extenders. I have 3 ********* X-Touch and there I also can only map 8 parameters.
There is a modified MCU script which lets you have pages for controller mapping, however some things might not work since Presonus doesnt give out any doumentation of their scripts and API.
https://github.com/daslicht/Mackie_LSMod
When You select a channel in StudiOne does you Macki Contro follow and change teh bank to the current selected channel, or do you have to manyally step through banks once you found it? (on my x-touch i need to manuall seach teh channel , lame)