I often have a dozen listers open, sometimes they are even dual listers. Is there a way to make a lister stand out? I'm thinking changing the task bar icon or tab colour, lock a lister so it can't be closed without confirmation, something like that. Even changing the Dopus sun icon into a different colour instead of the usual yellow.
You could set a custom window title which would be visible from the taskbar when hovering (although the background colour would be too) or if it’s ungrouped.
If the taskbar is grouped you can also move windows into separate groups, which might work well. Let me know if you want details on how that’s done.
You can change the title for just one window via the Set LISTERTITLE command. (It'll be saved as part of layouts etc.)
There isn't a way to set a custom window icon (other than configuring Opus to use the folder's icon as the window icon, and giving the folder a custom icon).