also - in my quest to replicate twitch/itch functionality with traktor and launchpad+djm101+scs.3d - the latest midimasher code allows u to take any (virtual) page of a device and create sub-pages in any area.
this let me take the bottom 3 rows on a launchpad and create two twitch style pad areas - where the top 4 buttons of each select the mode (sub page) and then u have 2 sets of 4 sets of 8 buttons ;)
full led recall too on sub page switching as with any page switching in midimasher.
the "launchpad.lua" config in the latest midimasher release has these twitch areas at the bottom of page 1. hopefully be releasing a full launchpad mapping this weekend - but definitely will now be improving the slicer code anyway