Sorry for the delay in responding- not n this everyday. Thanks for getting back
I think your first bullet point makes sense but may not be easily implemented. Various verb endings in both the singular and plural conjugations could also be either formal or informal and could become voluminous…,the way CM is set up now, it’s just a roll of the dice, as to which version is correct. Perhaps some blanket wording up front for the missing choice, might be helpful? e.g., : "Unless otherwise indicated the response should be presumed to be (formal/informal),…,however, as you say, there would be a lot of questions that would have to be manually scrutinized/scrubbed for this suggestion to work…
Otherwise, your second bullet may in fact be more practical to implement,… if the system allows manual input of suggestions (I think it currently exists for alternative verb and noun synonyms), then perhaps a data base for formal and Informal responses) could be included and eventually added to the existing data. This would also mean strongly suggesting input from users, especially since most of us are intermediate to advanced level parties and may be seeing the same issues.
Sorry, but at this time I have no other original ideas or suggestions- but if i do get an epiphany one day…
Again, thanks for responding