Hi @jdelavaulx
Highlighting layers has been discussed before (many times) and I think the main reason for not doing it, is speed (as it takes time to update the layers list, especially if there’s a lot of layers). For your workflow, I’d either make aliases or keyboard shortcuts to speed things up. If you select an object(s) on the layers you need to isolate, you can use SelectLayer to bring up a dialog box with the appropriate layers already selected, press enter and then run Isolate. If you have both commands as an alias, it takes less than 2 seconds.
HTH, Jakob