I'd like to have a useful feature which is probably very trivial to implement: absolute song positioning.

For example, when pressing on the volume knob, a slider appears (just like the volume bar) which behaves like the song position slider in Winamp.

I don't understand how such a slider is supposed to work. The empeg doesn't have a mouse or a touch screen, so you can't point to the absolute position you want. You'd have to hold the left or right button to move it around. Wait... that sounds too much like a fast-forward/rewind control.

I think what you are really asking about is a more sensitive / faster fast-forward control.