You have a few options there. You can get a 6' bar, which might be better, they tend to have a lower capacity, though, just some hold just 150lbs, some hold 300lbs, this holds 1000, so make sure you know what you're getting. You can deadlift with a trap-bar. They are a GREAT tool, but only 5' long or so. You can do reverse-lunges off of a step, and get the full suqat range of motion. This is not quite as good as working both legs and your back with a heavier weight like a squat, but I've built some good mass doing this. Especially when you combine lunges with a set or two of deads.
Most people that lift on a wooden floor need some sort of protection for it. The best option I know of is horse stable padding, which is basically a 2" sheet of shock-absorbent rubber. It does smell up the room with rubber stink for a few months, but you can air out the room a lot in the summer