Fantastic! I use tab targeting quite frequently as well, but since we have to manually use the pet attack skill, I usually hit that in conjunction with another skill while clicking, so that I can send my pet in at the same time :P Since you've already looked at this thread here's another QoL suggestion worth considering:
Perhaps a WoW style key config screen, where you click a button such as "Jump" and it takes the next keyboard input registered (
http://isboxer.com/w/images/c/cf/WoW_-_Interact_with_Target.jpg). This would allow for greater customization, as I personally find QERTFG and Shift-QERTFG to be more comfortable (in place of the standard 1-6), with the current config screen, can't use the Shift-mod keys, although I'm not sure if the game client would be able to register Shift-R properly, while holding the W key to move, could possible lead to character lock-ups, but it does work on WoW, so I know it's possible. (I know apples, and oranges :P)
Other than that, I commend you on the work you do, and as a fellow computer geek, appreciate all you've put into this. I'm super impressed :P