What joystick do you have? Have you tried the different Joystick configurations available in the Options section? If there is one to match your joystick, then that's a good place to start.
The ship takes a little while to come to a stop because it has to apply the thrusters the stop the ship.
Yes, you can coast by turning Flight Assists to OFF. You can bind a key or joystick button to that function. So if you apply full throttle to get to full speed, you can then turn Flight Assists off and the ship will continue at the same speed - even after you set the throttle back to zero.
This one:
http://www.amazon.co.uk/gp/product/B...?ie=UTF8&psc=1
My joystick isn't on the list
I'll give the flight assist off thing a try tonight.
Thanks!