1. recognize proper nouns, especially when followed by ’s, and treat them appropriately when using "change all"
2. detect and correct word variations during a spell-check session without having to add them to the dictionary; especially important for occasional proper nouns
3. detect delayed shift-release capitalization errors, especially for proper nouns (e.g. "my name is ARvind")
4. detect typing error patterns within a document and adjust spelling/grammar suggestion accordingly
5. use phrase patterns to refine suggestions ("in touh with" is probably "in touch with", not "in tough with")
6. detect spacebar order errors ("this is n ot the case")
7. infer multiple whitespace usage conventions from the document (don't ask each time you encounter e.g. "and so ,   we can" to change to "and so, we can" once I make the change)
8. show me what "change all" will change, especially if it's a grammatical suggestion and/or there are variations
9. turn off "resume" mode when clicking into the text area after loss of window focus
10. detect compound grammar & spelling errors (e.g. "she is alectureer" should suggest "a lecturer" instead of just "lecturer" to avoid introducing a grammatical error)
11. detect typing errors based on keyboard button proximity patterns (e.g. "traip" is more likely to be "trail" than "train")

[update: the Office Natural Language team has a post on the issue]