One quart in 5000 miles isn't what any manufacturer would call excessive. However, if that quart is winding up in one combustion chamber, say due to a bad valve guide seal or bad oil control ring, and causing a misfire or other problem, the ESP may still be convinced to fix the problem. You're going to need more diagnostics from a qualified tech, not one who just blows it off as normal oil consumption. If you saved the plug that was fouled, show it to the tech.
Hot start kick-back / backfire through the throttle body could have many causes, tune related or mechanical. Worn compensators on the 110's was one issue, automatic compression releases another, and in some cases the tune could also be a problem. Once again, it will take some good diagnostic work to sort it out.
Jerry