Wow, simple movement isn't that simple, when you get down to game mechanics.
While we want to build the game around startships, first and foremost, there are some things that travel faster. We need to describe those objects, so that we can derive the speed limit of the game engine.
Beam weapons should be instantaneous, as if there was some kind of quantum entanglement with the target. It's not realistic, but it's what everyone expects.
Direct fire torpedoes, like the photon should travel about 2 to 5x the max speed of a ship. This will force players to gauge the turn-rate of the target.
Seeking weapons will have to be variable, but slow enough that running away helps. The original SFB 'slow' drone seems like a utility device drafted into becoming a weapon system. You'd think they would have sped them up before putting designing ships around slinging them. SFC has 'missiles' which connontates something that goes pretty fast.
This leaves administrative shuttles, which should probably go faster than SFB allows.
Fighters never translated to SFC very well. Maybe we can experiment with giving them greater top speeds than ships can achieve. PFs work well, so I see no need to differentiate them from ships.