Ryan-
I do not think anything was overlooked with the buy now button- it does show up- just not for the first submit sometimes. There’s a glitch somewhere. I am looking in to it, and if I find a fix just for that function, i will definitely pass that along to you so you can get it working right without the second submit.
That plugin DOES need some love. Like I said- it was released as a free offering, and most users have done a lot of their own additions or changes to it.
We do plan on adding to it, cleaning it up, and then re-releasing it as a paid, fully supported extension.