Does swear by any Google Doc add-ons for ensuring that certain invariants hold in the creation of large google docs with many contributors over many weeks.

I am looking for an extension that I could write arbitrary rules for that would run against my doc. E.g.

- Don't use the word "participant" - Replace with "subject" - Don't use non-standard styling, only use paragraph styles

I found Red Flag - but that seems to get low reviews.

Suggestions are much appreciated.