You can certainly make such a request, and having an MP support whatever facts you want to present helps ensure that your submission is read more quickly. How an outstanding H&C decision poses any danger to someone is what you'll need to demonstrate, given that you may just as easily receive an expedited refusal. Would it really better suit you to be refused earlier?
If the concern is that you might be removed from Canada (just hypothetical thinking here) before receiving a decision then you share that concern with most H&C applicants awaiting a decision, so the reasoning has to be something special.
Good luck.