Feature Request: Add customisable playback speed and a bigger slider bar

Current version has a smaller slider bar and most times it is difficult to slide in one go. Also it would be great if instead of a slider, plus and minus icons be place on both ends of the bar to facilitate easier increment/decrement. I'd also like to request each interval step be set to 0,05x rather than staggered rise in speed. For audiobook books these step increments help a lot. If minus/plus option is cumbersome, please just add requested step intervals and if possible zoom-able slider ball(big finger issues).

Thanks.