Racer's track editor can be used to make custom courses from Themes that have been exported from Blender.
When you create a new track, you will be presented with a list of themes. To get a different theme in the list, copy it into your racer data directory. You can nest it under sub-directories, as long as they all have the word 'theme' (in lower case) in the name. Double click a theme, or select one and press new to create a new track with a theme. You cannot change the theme of an existing track, but you may (carefully) edit a theme itself once a track has been created.
There are several different types of control points that alter the track layout.
Right click on an edge to access the edge menu. You can:
You can change the view's scale to fit the entire scene by pressing Best Fit on the toolbar or view menu, or pressing Control+0.
You can view the track from the top (default), the front (this is like looking from the bottom edge of the top view), or the side (which is like looking from the right edge of the top view).