SABL

If you attempt to reinsert the "room" fuse, which in my understanding supplies the interior lighting system, you WILL get some sparks due to the "load" that is in demand because ( I assume) you have the car door open. This will be normal....but if the load excedes the 10amp rating and causes the fuse to "blow" then you have a problem. We still need to find the reason why your brake lights remain on. If you disconnect the brake switch and the brake lights still remain lighted or lit then you have a problem further downstream.....something is providing a power source to your brake lights. Backfeed is unlikely if the brake switch is disconnected.....a circuit must be completed or "closed" for any power to flow.

I did look at my Taurus ...1999.....and did notice that I have two switches connected to the brake pedal....perhaps you disconnected or tested the wrong switch? I will look into this "situation" and see what I can find.