Auto-pause?
Or just use a quicksave if you mess up. Or fight. That's a risk you have to take if you camp in enemy territory.
Auto-pause could work. "Just savescum" less so, especially for people playing Ironman, but auto-pause could work.
Can you really lure them that far away? That extra manouvering and planning does change things.
It also opens up possiblites for new ways to occupy enemies.
Setting up false signal transmitters for patrols to investigate, or even splitting your fleet so one part can lead the enemy away while the other loots. Ah, a man can dream, but I doubt we'll ever see something like that.
If I can lure them 1 SU away I can lure them a million SU away, it's just a question of repeating the same motions more often. And doing ten manoeuvres instead of three doesn't sound like compelling gameplay to me.
The other possibilities...I'm not sure. I'd never trust the AI to pilot my fleet in a way that won't get all of those decoy ships killed, and it'd be a right logistical nightmare to code, I imagine. False transmitters is kind of like you doing a scan to attract distant attention, but something more flexible would definitely a nice addition. All those pirates and even a few remnants get hidden transmitters to notify distant fleets when someone tripped the sensor, surely the player could use that same idea against them somehow...
Faster is not equal as instant.
Even the finest shipyards and machines working in double shifts, 24/7, still took DAYS, WEEKS to repair damaged ships during WW2, and it's not really any faster today.
More advanced technology may speed it up, but more advanced technology and bigger ships also means more stuff to repair and more difficult to repair.
Probably not "instant", although the Persean Sector might have the kind of technology that reduced shipyard repairs to "close enough to instant". It at least sounds like it's definitely faster than WW2-era repair speeds, because from the sounds of it a WW2 ship couldn't have repaired itself up from "1% hull remaining" to "fully repaired and combat ready" in the span of a week while out at sea and moving forwards at regular speeds that entire time, like Persean Sector ships can put ships back together that thoroughly out in open space while travelling around like normal.
From a gameplay perspective I also don't know what interesting mechanics would come from repairs taking time. If time was an issue you'd just not repair at a spacedock and have your ships repair over time while going towards some time-sensitive objective, since dock repair is no better than space repair other than time. That, to me, is no more immersive than "repairs are instant". Hell, if anything I'd argue that instant repairs are
more immersive than repairs taking time - it'd take nothing short of magic to pull that off in the modern era, so it's a good show of Persean Sector technology having become sufficiently advanced. As one would expect from an era of relatively casual FTL space travel (and after a Collapse, at that).