From @alefragnani on November 2, 2015 0:36

It should be really useful to be able to update some of the user settings for my packages. I only found vscode.extensions.getConfigurationMemento which is readonly, and vscode.extensions.getStateMemento which is read/write, but its content is not stored in settings.json. Is there any other way for this?

The update that I want to do is, in fact, only a shortcut (command) that I gave to the user. So he can use User settings menu to edit the value by himself, but also add/update its content based on commands that I registered.

Thanks in advance

Copied from original issue: Microsoft/vscode-extensionbuilders#77