This being the internet, poor grammar and incorrectly spelled words are a fact of life. Even when we had a spelling check function on the posting window, many people did not bother to use it.
Zero tolerance has caused some odd problems in schools, with stories that would be funny if they were not so serious. If applied here, particular misspelled words would get users banned. So we should have an exception for unintentional misspellings. But what if similiar words were intentionally misspelled, to get around the zero tolerance rule? That would call for a judgement call.
If you are going to trust the staff for judgement calls anyway, the suggestion here seems redundant. I have had no issues with the Admin or Mod staff.