Modless mode

A way to safeguard against mod exploits and issues, and guarantee steam achievements (if implemented). This could be a command line interface flag or an option in the start menu to "enable/disable mods" (which would require a restart). Saved games would have a 'nomods' flag/property as long as they were saved with mods disabled, and only games with this flag would count towards achievements.

this game does not have Steam achievements.
if you don't want to use mods, just don't install them.

I need to use mods to develop and test my designs, but not in my normal runs.