Sigh, I was going to post that but I personally didn't think it was that big of a misdemeanour on their part as you were alluding to. Sure its another artificial limitation though. Should have gone with my gut feeling.
When I fly the Airvan I go full throttle on take-off where it stays for the duration on the flight. Due to operating in a noise sensitive area once clear of obstacles I actually further retard the RPM to 2400-2300 where that also stays for the duration the flight. I'm another one of those lazy ones that likes to minimize fiddling in the cockpit. Once leveled out the mixture comes a fair way back and I'm done.