To prevent the current abuse of Auto-fire and possible future abuse of other Qualities that can have multiple activations, I propose my very simple house rule on Jury Rigged.
Replace "decrease the Advantage cost on its Critical, or any single other effect by one to a minimum of one" with "gain one automatic Advantage on all checks related to its use" in the Talent's text on page 138.
This prevents the broken Auto-fire usage of the RAW while also making it a bit more flexible since the free Advantage is now 'floating' (not affixed to Critical or any particular Quality) and can be assigned as desired when making checks with the weapon. I consider this a positive change all around for everyone except those that specifically sought to use the RAW Auto-fire exploit.