So I'm late stage in an Edge of the Empire game and I would like to present my characters with a challenging final battle. They're on a Star Destroyer whose captain is trying to turn it into a mobile armor smelting facility for a kind of energy absorbing armor so his Stormtroopers will be the best the Empire has and hopefully gain favor with the Emperor, and my PCs have boarded it to kill him and take revenge on him for screwing them over the entire campaign (they're mercs, so it takes more than "stopping the evil Empire" to get them angry enough to take on an Imperial BBEG). The captain allowed them onto his ship because they've been a thorn in his side and he wants to dispatch them in his presence; blasting their ship out of the sky is not good enough for him, he wants to look them in the eye before executing them. If they make it through his crew of Stormtroopers and face him, great, he can kill them himself after wearing them down. If they're cut down by his forces, then he'll have their near-dead corpses dragged to his quarters and he'll gut them there. So I'm trying to funnel them toward their final destination by giving them a "dungeon" to fight through filled with traps and puzzles for them to solve so it's not just combat and the epic final encounter feels earned.
The problem I have is that we ran the Black Ice module before this part of the campaign and despite reading the module before running it, my eyes somehow glazed over the part where they were testing a lightsaber in the facility the PCs infiltrate at the beginning of the module, and I read the description of the room they were exploring - a kind of weapon testing lab where a bunch of exotic weapons were being tested, including a lightsaber - before my brain said, "Hold up, a lightsaber could seriously unbalance the kind of game you run!". And now the heavy hitter in the group has a weapon that can cut through doors and such with little difficulty. He's not a Jedi, just a weapon specializing bounty hunter who normally shoots the big guns, but with a lightsaber.
I'm drawing up maps and I keep running into the issue of, if there's a character with a lightsaber, what's to stop them from just cutting open a locked door? If they can simply cut open a door stopping them from progressing, they can just mosey on through it without the need to explore. I thought of a couple ideas, like making a door take 1D4 rounds to cut open, or electrifying certain doors to cause feedback on the lightsaber or something, but I'm not sure how fair these would be or if they're appropriate GM tools to use in this situation. I don't want the players to feel like I'm punishing them for possessing a cool weapon, I want it to feel like a justified way of stopping them from just "laser swording" a hole through the dungeon to get to the BBEG.
Got any ideas for me?