My Beta version is 123.9 so your 1.24 should have all my info and more. At the bottom of the list of displays was a Banks suggested guage display and it shows DPF RG % soot and goes from a lower number to 100 and stays on 100 until the regen is done and than resets to something less than 20%. As far as I know the 22 R LM2 does not have a manual regen option and I haven't tried to look for one?
During the initial install there was a list of items you could select once you chose the truck version and you should be able to see the soot option that you can choose or if you don't need to play with it like me, I chose the default and it shows most of what I want. FWIW