I don't know if this has been mentioned, I didn't find anything in the search function. Anyway, the boulders that fall from cave-ins can land in the unminable area around cave entrances, and it is ugly. Similar to the log on ledges problem. It would be nice if they couldn't fall there, or if there was some kind of decay hit that eventually did away with them over time.
Maybe someone can mod Ender's in a way that doesn't show unreachable logs and boulders?