Is there any way to make colors for the entire height of a track? Now it is only for the bottom bar of a track.
No, there is no way to do this, unless you use the theme window to change the colour but that changes the colour for all regions to be exactly the same. Not what you want I guess.
There is this proposal in Mantis that probably covers what you want, but it has yet to be implemented.
Add a note to it if you have any comments.