I have been discussed with friends and we each of both of us thinked that there is no real nessecity to have grammar checking (or speling). It's not as bad as what we used to could, so there's no need, as long as every people spoke proper England.
Not AB. At least not in auto correct mode or the place will look like Word in mid-edit. Also, sft42 should keep the accent but since AB must be of some educational value peer pressure ought to be able to encourage folks to write in English (yeah yeah, or Scottish) and use or improve their grammar. txt's gr8 on the moby, but not if there's a full qwerty in front of you.