There's two switches on every floor, partially because the floors are randomly shuffled at the start of the game (I'm assuming your BF3 was either the Lava, Electric, or Plant floors since you mention the jumping puzzle).
If I could add an option to run or something, I'd have added it. I've tested it in the past, and the script I used to do the first-person stuff doesn't seem to allow for different movement speeds, unfortunately.
Glad you enjoyed yourself, even if you couldn't find that second lever. Lol.