I don't have a pump, but use Humulin R. In case this helps anyone changing to R, here's my experience.
My endo recommended R for gastroparesis. I need the slower onset & the longer duration of R with delayed stomach emptying. R takes about 40-45 to begin working & stays around longer than rapid acting. Lows are still possible, of course, but it's not the awful feeling of rapid descent experienced with faster insulin. Compared to rapid acting, it's smoother because it's slower. Not an insulin to quickly correct highs. I use Apidra to correct highs & for faster digesting meals. For some meals, I use both Apidra & R.
I have different insulin:carb ratios for Humulin R than for Apidra. R doesn't cover as many carbs for me & I don't know if that's typical.
I also find that R works better than Apidra when I'm sick. Perhaps this is because it lasts longer.