Hmm. I was thinking just the object layer and blanket setting them all to on or off - though I can't see an issue with the GM layer being affected too. Mostly, I'm just thinking in terms of what players are seeing - things can get so crowded and cluttered when there are names everywhere, but its often also important to be able to see the names too. Being able to quickly switch between them would be a lot more convenient than repeatedly ticking and unticking boxes within the individual tokens. If you (or someone else) were to write one up, it would be enormously appreciated!