COMPLETIONISM OR DIE !
After my own heart, I see.
Strangely now deaf critters so I can't have them to leave the area using a grenade/pyrokinesis.
Well, premeditation will let you tag anything that's at the edge of your sight radius, or if you don't have premeditation for some reason cryokinesis has a very long range. So run over, tag one, and run back. Probably fewer than all of them will follow. If you've set mines and got grenades, you can safely pull them back and kill them one by one. Stay on the landing, keep the big beetles locked down, and Broderick will both be helpful and survive. You can bandage him up between the fights. It's just a matter of pulling well.
it would be nice if you could sail back to Junkyard and play the rest of your playthrough without a ferry captain in there, essentially removing fast travel from Junkyard and cutting off access to Silent Isle without a jetski.
Can you imagine Gorsky's reaction to that, though? There'd be nothing to influence Junkyard away from total Protectorate control. He'd lose his mind.
Then, later, you could get him to recommend Dan as a replacement boat captain. Foundry got boring after the mine kerfuffle was resolved, so you can get Gorsky to recommend lazy old Dan to take over that - actually quite economically important - job.
"Man, why would I want to go run a boat service when I can just stand here and watch nothing happen?"
"Dan, you could be your own boss. And who knows, maybe there would be pirates to shoot at sometimes? You'd make better money than you do here. And if a customer tries to stiff you, you can punch him and drop him into the lake."
"...you had me at punching random people."