I guess you could say Thorfire is lazy and/or doesn’t want to risk the newer version having a flaw or issue. So they just leave it as it is. It’s works fine as is, it just lacks a few features. It’s also possible that they need someone to tailor M v1.2 to work reliabily on the Q8. I’m not sure.
I don’t know if there is a changelog between M v1.2 and M v1.3. I don’t think any features changed, it was mostly cleaning up code, tweaks, etc… that the user will not see. M v1.0 to M v1.2 is where we had all the changes that the user notices.
Here is a link about NarsilM in general, but it’s not up to date, I think. NarsilM - configurable e-switch firmware for Multi channels, v1.3
No other lights come with NarsilM, although Lexel and Texas_Ace do make drivers that use it if you want to convert an existing light to using it.