Regarding the beans, when making chili, I don't drain, don't rinse, and don't cut back on the salt. When making other things, I usually drain but reserve the bean juice, and almost always end up adding it to the pot. I think the bean juice has a unifying effect on the flavors. It's just water and bean starch. What I would NEVER do is thicken chili with corn starch- ICK! I am pretty sure the bean starch acts as a thickener, but the thought of adding corn starch grosses me out!