Ability to save any type of object in library. So if I have custom data function or for that matter any custom extension whose state I want to save in library and make it sharable it is not possible.
In case of data functions things like conneciton parameters or IT controlled settings can be saved in the library adn then folks should be able to just retrieve them and use it.
IronPython scripts; JavaScript scripts; TERR Expressions, Spotfire custom expressions; Formatting, themes; Auto sync so if the library item is updated, all DXPs will use the latest