Currently Koha only allows cloning of rules at the library/branch level. There should be an ability to clone rules on patron categories. That way, if you have multiple patron categories, but many of them share a rule regarding an item type, you could write the rule for the one patron type, then select "Clone to" and be able to multi-select the other patron categories to which that rule also applies.
Still valid in 16.05, removing assignment to me
Key for me would be being able to multi-select the patron categories. Another Symphony feature we're leaving behind.