I wouldn't. If an update slips through your filters somehow, standby and quickstart will automatically install it. Better safe than sorry.
It shouldn't, as the URL I used covers multiple IP Addresses. As long as that update address doesn't change, I'm fine. And even then, it's hardcoded into the system, so it cannot change, and therefore, cannot slip through. Only if my access point was factory reset (And even then, I'd have to set it up again) would I be screwed.
Edit: It just tried to download the update again, and errored out with the code 108-0066.