Bit of design theory here…
I wonder if at any point, the design team at FFG contemplated folding the Accelerate/Decelerate maneuver into the Fly/Drive maneuver. As written now, you can get into a weird situation where one starship is heading toward another, and it uses its turn to carry out two accelerate maneuvers. In this scenario, the starship is now going a lot faster, but contrary to what one would expect, it doesn’t actually move any closer to its target because the pilot didn't use Fly/Drive to change range bands.
An alternate way to design vehicle speed changes might have been to allow a single free speed adjustment of 1 (either up or down), as part of the Fly/Drive maneuver. Perhaps you could then optionally suffer starship strain to make that a 2-speed adjustment instead or just 1.
When you think about it, making a vehicle go faster or slower usually just involves pulling a throttle lever or pressing a gas or brake pedal. It's an action so trivial it hardly seems worthy of costing a maneuver.
Now, I caveat all of this with the understanding that this stuff is largely an abstraction, and I realize that. I'm just putting the subject out there for discussion and consideration because I like design craft.