More for jerboa, but RIF had an option to confirm you want to go back/refresh feed. My palm accidentally hits the back button often, and I have to start scrolling back from the top.
Even better yet, Relay had a dedicated button that hid all posts you'd already viewed so you never had to worry about accidentally refreshing your feed as you could just hide everything and go back to where you were. It even had an option to automatically mark posts you scrolled past as read so you didn't have to open posts that you were only going to read the title of.