A few tweaks and logic adds would greatly improve the ease of use of Intelligent Task Parsing for dates:
Don't mandate a ) at the end of the due date. The leading ( should be enough of a date queue for the system. On mobile devices, getting to the ( takes enough time. Closing the parenthesis is a bit of a time suck
Example: Make lunch (tomorrow
Recognize logical date shortenings
Mon, Tue, Wed, Weds, Thu, Thur, Thurs, Fri, Sat, Sun
If today is a thursday (Thursday) means 1 week from today
There may be a few more other users can suggest (I believe someone suggested a parsing for starring a task, that would be good as well)
I like this idea and I've incorporated most of what you've said in iOS with TextExpander. So I can use a shortcut like "tm9" and it will translate to (tomorrow at 9am). Granted, I have to remember all of my shortcuts and what they mean, so it would be nice to have Todo recognize the shortcuts you mentioned.
But for a workaround, try the shortcuts with TextExpander, it might help you out.