Color-coded Sequence Tabs
The tabs of different sequences that line up above the timeline should be colored to match their label color in the project bin. Often you're working with a dozen or more sequences with complex and very similar names, dragging or copying shots and sections and making other revisions. It's easy to tinker away for a while and then realize you've been revising the wrong sequence! Color-coded sequence tabs. Take it to the bank.
Roger Heyward commented
100% agree! This has happened to me numerous times, and this idea of color-coded tabs could be a great visual cue/warning which sequence you are working on.