Jason has a good point. That's a good way to tell which fixtures are unused on a per-cuelist basis. If you don't want to unblock your whole show cuelist, you can also create a copy of it, unblock the copy, check the last cue, and delete the copied list when you're done.
I do still think it would be useful, however, to have a report that could provide usage information for the entire showfile.
Jason has a good point. That's a good way to tell which fixtures are unused on a per-cuelist basis. If you don't want to unblock your whole show cuelist, you can also create a copy of it, unblock the copy, check the last cue, and delete the copied list when you're done.
I do still think it would be useful, however, to have a report that could provide usage information for the entire showfile.