Zone scope editable for access rules

Once an access rule is set up only its action and its note can be modified. Whereas the value does not need to be modifiable (that would be a different rule altogether), it would be nice if its zone scope was.

Speaking of which, considering rules are not necessarily zone specific maybe it would be a good idea to separate zone-specific from global rules visually in the UI, respectively make it possible to have more granular control over which zones a rule applies to (as opposed to just single zone or globally).