This is for version 2.3
I'm not sure if you want beta stuff posted here. Feel free to delete if not.
I was messing with the Auto Nodraw window tonight. I suspected it might be very handy to have an Invert Selection then apply NoDraw button as well as a Remove NoDraw and Invert Selection then Remove NoDraw buttons. I found it very helpful in fixing some gaps left by my models. I've included a screen shot of what I added. I just cobbled existing stuff together. It could perhaps stand to be refactored a bit especially if any more tools find their way into that window.