It is great that individual items (track sections) can be selected and be moved around. Multiple items can be slected by holding Ctrl and clicking on items. This can be tedious if there are many items. Hence, there should be some way to select multiple items just with the mouse as well as an option to select all items. This could be implemented via Shift + Drag (selction with the mouse) and Crtl + Shift + A (keyboard shortcut to select all).
Please let me know if this feature exists already and I simply overlooked it.