Personally I wouldn't hire him, because of the totality of his postings
here, going back to wanting to sue an FBO over aircraft availability
issues when he was working on his private, I think he's hotheaded and
would be difficult to deal with especially if something in the
transaction didn't go as he expected. His bragging about rolling a
non-aerobat 150 may be just a momentary lapse of reason not to be
repeated, but it's just icing on the cake as far as I'm concerned.

So long as you know how to and can maintain positive-g throughout the
roll, there is nothing wrong with rolling a "non-aerobatic" airplane.
Maintaining level altitude might be a problem, but there is nothing
wrong with rolling in a descent. This gives the advantage of using
gravity (altitude) as a source of energy.