You are legally limited of course, but no the aircraft won't prevent you from going above where you're allowed if you set the slider higher. That's what you need to set if you want it to help you stay where you should.
I'm not surprised prop noise hasn't decreased much in 8 years - it's not a priority in most commercial builds and nor would most of us want it to be - stealth is not usually much of a factor in our flyings I would imagine, and making these things...