I downloaded your calculator and modified it so that I wouldn't have to keep checking all those buttons. I also added cookies so that it will remember the weights I put in for the calculator. Now all I have to do is go to my custom calculator, adjust the weights, click calculate and write it all down in my notebook. You might consider adding cookies to the real version to store people's choices so they don't have to keep putting the numbers in and checking all the boxes.
And as far as the 45lb bar and all that, I just do it with the many many reps of the empty bar. Whatever. I'm not doing starting strength because I feel the weight increases are too aggressive for me. I hurt my back and had to work my way back up (still working my way) and felt like I should do a program with a more gentle or slower process of building strength. I find the sets where you try to do as many reps as you can to be a nice reminder that although I still can't bench more than 75lbs x 5 I can indeed bench way more than 5 reps at 70lbs now so there's been some kind of strength gain of some sort.