"Auto Save" feature for the "File Output" node

Whenever a change to the compositor's node setup is made regardless the state of the rendering process, the file output node does not execute. For now you always have to re-render your scene or parts of it.

I'd like to see a feature where you can check a box so this node would automatically save all desired outputs instantaneous. (or manually by means of a button instead of a checkbox)

NOTE: this feature could result in a slow workflow process as it is possible that the file output node will save hundreds of MB every time you make the slightest change. Therefor I would suggest to have it turned off by default.