Not yet... but I made an account and will try to learn how it works so I can put it there, as well as make pull requests to the official firmware. I do need to clean the code slightly and separate the Atari/Amiga specific stuff with ifdefs before it can be merged back.Are the ST firmwares You are using on Your Guthub?
It's attached and it's awesome if you want to test it
Note that TOS2.06 does not auto-detect and enable FastRAM like EmuTOS do.
So I made a small .PRG that you have to run if you are in Atari TOS and want FastRAM - it's included in the zip.
Unlike with EmuTOS, I don't have a way to load Atari TOS itself into FastRAM yet though..