Option to change tempo (BPM)
What is the problem you are facing?
Sometimes I would like to be able to change tracks BPM. For example, you are listening to a track, and you would like to slow it down, or accelerate it. Like on YouTube, you can choose the playing speed, or like DJs, when they mix, they slow down some tracks, accelerate others.
Basically an option to reduce/accelerate speed by 5-10-15-20-50 pct (you choose the value). Don't know if it's technically possible, but it was and idea that came across my mind. :)