I went to add a seventh condition to a nymshifting killrule and nothing happened. I assumed 6 was the limit and created a new rule instead.
Then I got curious, and hit [+] a bunch of times and got more than 6.
I went back to the original, and the new empty condition line comes up off the bottom of the conditions box 🙂 There's no indication that it exists to enter info into. Suggestion: scroll the box automatically when someone hits + on 6 rules?