Mesh Leveling is easy:
In the attachment you can find the .hex file and a Marlin folder with the sources itself.
Changes to original-Marlin 1.1-RC2:
.) TAZ specific values added (steps/mm, …)
.) New value in 1.1 “Travel acceleration” set to 1200
.) Enabled FW retraction with my best values for that
.) Enabled SD Support (of course…)
.) Reduced extruder acceleration from 3000 to 2400. 3000 is TAZ 5 default, but thats to high. Extruder is missing steps, resulting in blobs when unretracting. 2400 is the highest safe value for my extruder.
.) Enabled filament change possibility
.) Preheat options for PLA and ABS
.) All “Lulzbot-specific” changes (only Boot logo and another font, to be precise 
)
.) Just for information: Thermal protection is enabled by default in this Marlin release, so your TAZ shouldn’t get on fire as seen last days in this forum 
Edit: Use it at your own risk, of course…
Marlin.rar (482 KB)