the reason you can use other time as the A code in figuring out time is because youre still responsible for the airplane.
Plus, it makes up for the fact that civilians log block hours which even after we do a military conversion is usually more. For example on any given day, My brother (Mesa) logs "7-8 hours" of flight time when he flies out of O'Hare, 2 hours of which are spent on the ground.
its not dishonest as long as your not hiding it, just be smart about it. talk to any reservist at your base theyll do a great job of explaining it