Heavy
I'll admit, I haven't actually had a chance to try this yet, but I was talking to a couple of my cousins who are store managers, and they told me that if you order your burger and ask for it "heavy" then the sauce amount will increase substantially.
Not for the faint of stomach, too much sauce can cause problems like extreme flatulence, or irritated taste buds, but if meat patty swimming in a kepchup/mayo swirl is your thing, then you'll love this.
Please test and give feedback on where or if it works in particular stores.
Should have the coupons available soon too.
Usually they use too much mayo.