One of the checks that I'm aware of, not having read anything, is that her base range is 525 (tied with Quinn for what I think is the shortest adc range) and she can't have both the 130% attack speed and 700 range splash damage at the same time- The attack speed will only apply to her first attack if she switches weapons. Correct me if I'm wrong, though. EDIT: Okay, so Kog'Maw is the shortest base with 500, but he has a reason for that. EDIT2: a lot more posts than I thought- toggle skills don't proc trinity force or tear so that's a nonfactor, and
Manamune procs on basic attacks as it is, and that could be another one of the checks they've added, though I haven't had the ability to see for myself- maybe it doesn't count that?