I often see internet conversations which have dissolve into grammar critiques, I don't think they are enlightening, they are usually in the trolling portion of a flame war. I am not turning in a paper for a grade when I post to Hubski and I keep my editing on the cursory setting with this in mind. I often admire when others post a tight well tuned essay but I don't feel that any exacting precision is needed to share and communicate ideas in the Hubski format. I think that your idea sounds like no fun at all.

I don't mind your post grammatically but if I wanted to feel a bit more confident about it this is how i might approach it.

"People have often commented on my poor grammar. I think that there should be a grammar tag to indicate that a post contains improper grammar. There should also be a way to highlight poor grammar in a text which when corrected would remove the highlight and flag."

Both bits of writing say the same thing, good enough. I don't use "So" "ect" I avoid the necessary use of commas where you just don't use commas. This is probably the only time I'll ever comment on someones grammar here, it just doesn't seem to be a worthwhile way to use my brain power.