A simple and effective method of sequencing is Cut and Paste. You can Cut any selected objects and Paste them at the end of the sequence, or before or after any other object.
The normal Paste (Ctrl-v key) will paste the objects at the end of the design.
Using this method, you could drag or click-select objects, cut, paste, and move on. You are sequencing the design by the order of your cut/paste operation.