The ability to customize the order of tracks in sequencer is on our feature list. I’m hoping we can get to it in the next few releases.
For now, you can also try using the label system - right click on the track and set a label (for examples ‘aaa’). Then in the type in field next to the +Track button, you can type: “label: aaa” to show only those tracks that you’ve set with that label. I know this is definitely not the same as reordering tracks, but maybe that will help you along the way until we can get that feature in.