I tested Steem with TOS 1.0, 1Mb in STFM mode. Now I run with TOS 1.2, 1Mb, STFM and if something doesn't work on that then I try it on TOS 1.0. I see what you mean about SainT. Unfortunately I don't have a real TOS 1.0 machine to try it out.
I am using Steem version v3.2. Steem Debug version also does the same with Automation 97.
Still got, still working: Atari 4Mb STe, 520STFM, 2.5Mb STF.
Hardware: Cumana CSA 354, Ultimate Ripper, Blitz Turbo, Synchro Express II (US and UK Versions).