Feature summary (what you would like to be able to do and where):

I am building a preference which shouldn't allow local exceptions. I can currently achieve this by using the GlobalPreferencesAutoPrefs configuration variable, however I don't want this to be configurable. It is proposed that we make use of extension attributes to allow extensions defining preferences to also register them as automatically global.

For example I would add this to my extension.json

	"attributes": {
		"GlobalPreferences": {
			"AutoPrefs": [
				"mypref"
			]
		}
	},

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):

• Preferences which should never have local exceptions

Benefits (why should this be implemented?):

• For preferences that should never have local exceptions it is safer to avoid use of configuration.