GIJ is a great tip! I immediately did some research. Both GIJ and Warzone scroll at approximately 25 px/s. Given that Warzone's viewports are much smaller, the perceived speed should actually feel proportionally faster. Additionally, Warzone features 16-directional movement, whereas GIJ has 8-directional movement. Despite these facts, GIJ's controls feel more responsive. This might be due to GIJ having a much higher rotation speed. If that's the case, making similar improvements in Warzone is challenging because the game must maintain balance among different vehicle types. E.g. it's necessary that tank rotation speed is very limited to give planes a fighting chance to succeed in strafing runs. Everything depends on everything. (…and that’s what makes game designing so interesting :-) )
This definitely deserves more thought.