In some menus you have to left-click an item once, and then click a button to “execute”/“activate” that item.
By allowing us to double-click items to “activate” them, i.e. double-click a song in the Sheet Music menu to play it, it would add a lot of quality of life for such a simple interaction.
The same goes with other menus, i.e. Mounts. Double-clicking to mount up would be great.