Re: Flight physics
As mentioned, Lucas modelled things after WW2 dogfights. It makes for interesting battle scenes and was probably easier to produce on a budget with the effects of the time. If it bothers you that much, think of it this way. The tech in the Star Wars universe is far ahead of our own, inertial compensators etc probably make the handling of these craft more akin to atmospheric flights so that pilots do not have to adjust between the characteristics when transiting between space and planet surface. Well, it makes some sort of excuse ;P
Even in the new BSG the show creators admit that while they try to make effects as close to true (well, known) physics as possible, it can't always be done if they want to keep the entertainment factor. So while it looks good and certainly appears realistic there are 'bloopers' there too.

