Opening up more versatile build paths for Heimerdinger..
Heimerdinger, while a pretty well balanced champion (in my opinion) has one small issue. In every game, your build is essentially the same. While the same can be argued about some other champions, Heimerdinger's design and kit is pretty unique so to not take advantage of that is a crime. More versatile build paths could be obtained with some small changes to Heimerdinger. The most obvious, of course, is to let his turrets take on a % of his BONUS defenses/HP. This would make Tankerdinger viable, and would encourage a more utility based Heimer rather than the basic "sit in my turrets and wait for you to dive me" playstyle.