Once set, Average Session Duration cannot be unset.
We all know not everyone uses this option, nor care about it. It is, actually, very useful when you want to play a game but don't have much time on your hands. From a developer point of view, this option is perfectly valid for games, as well as other media, such as soundtracks.
The problem arises when accidentally setting the option while filling out the Metadata fields and you're publishing a tool, or, if you're publishing a game, don't want it visible in the "More Information" box, and there's no way to opt out; essentially soft-locking the project in an Average-session-duration state.
So I think it would be a great addition to have the ability to set the option to "None" or have some sort of X button that clears out the field.
Thank you!