I absolutely hate myself for doing this, ndi, but you set yourself up.
Your post advocating the use of a grammar and spelling penalty is grammatically horrible.
However, it illustrates beautifully the fact that conveying your point eloquently and intelligently is not determined by the actual grammar. (And I hate myself for correcting it because I know I don't speak a word of your native language)
What you are asking to be rid of is lazy writing that substitutes 'U' for 'you' and uses the sort of language reduction that was designed for use in a system that restricted you to 140 characters and had to be entered on an alpha-numeric keyboard. Unless one is writing here on such a keyboard, it's unnecessary.
I doubt you could create a system that would select out that sorts of post.
But I would be opposed to anything which penalised people using a second language, an n900 keyboard or, like me, with eyesight issues peering at their screen.
(and before anyone looks - my typing is such I am certain there's a typo in this somewhere )
(*Hugs ndi and hopes no insult is taken*)