This is fantastic, great job!
My two wishes that would make it perfect to me:
1. Single click to add a new EQ band instead of double-click
2. Being able to use a modifier key to change the Q value (Ctrl + shift + left drag for example) as an alternative to the the scroll wheel. It's the only thing keeping me from switching out Pro-Q (to any other EQ for that matter) where you can easily frequency sweep and change Q at the same time, instead of having to stop the movement every time you need to do it. I guess it's just a personal preference.