The question of hyperspace continuity is something that has interested me as well. But as it is often said among fans… in Star Wars, starships travel at the speed of plot.
I believe it is more appropriate to assume hyperspace allows for near instantaneous travel, rather than how early West End Games and further EU material came to the conclusion that it could take days to travel across the galaxy.
I take the scene in the original Star Wars where Luke is training with the remote in the Millennium Falcon as the best example of this. They just have jumped to hyperspace not long before, having left Tatooine on route to Alderaan. Han enters the room, having just left the cockpit, and says:
Well, you can forget your troubles with those Imperial slugs. I told you I’d outrun 'em… Don’t everyone thank me at once… Anyway, we should be at Alderaan about oh-two-hundred hours.
The way Han says this makes it sound like this is the first time they’ve spoke since they escaped Tatooine, so it can’t be that long after they jumped to hyperspace. Also, when Han says “oh-two-hundred hours”, he doesn’t literally mean 200 hours, he’s referring to military time, which would be about 2:00 AM (Galactic Standard Time in their case? Lol). That would appear to mean that it will take them, at the very most, less than 24 hours to arrive at Alderaan. This contradicts the EU explanation that it took them days to get to Alderaan.
But here is the kicker, at the end of the scene, Han reacts to an alarm and looks at some flashing lights on the nearby console. His last line of the scene is:
Looks like we’re coming up on Alderaan.
This is a three-minute scene. If you go off this scene alone, it definitely seems like the travel time between Tatooine to Alderaan took at most hours, and the very least, minutes! The idea that space travel takes days, at least on established hyperlanes, is a complete EU invention. You could try to explain it another way, but it would be a pretty hand-wavy explanation.
And I say this as someone who likes the idea that space travel takes some time! I think it is a nice rule to have in a sci fi universe, but Star Wars isn’t that kind of sci fi universe. Lucas was never concerned about hyperspace continuity.
So I believe trying to limit the ability for certain ships to use hyperspace is just going to create more narrative problems, especially since it is already implied Rebel fighters can travel at light speed (Rebel transport escorts escaping Hoth, Luke traveling to Dagobah and then Bespin, and the fighter escorts around the fleet in the final scene), and we actually see them jump to lightspeed in ROTJ. Long range fighters, like Tobar said.
Also, I’m pretty sure Ady showed those X-Wings escorting the transports jumping to hyperspace in ESB: Revisited, so not showing fighters in hyperspace in ROTJ would contradict that.
Hope you guys don’t mind the longer post! It is an interesting topic.