Damn, we've been writing at the same time!
Ok, the wp delete problem: Dp you know the # of these waypoints? Can't you teleport there? Or go where you fell down in noclip mode? Anyway, that's one more reason not to enable autowaypointing...
Ok, NOW I got your idea with the WP backup thingy. Yes, that sounds good! As I mentioned in the post I wrote just before, I'll stick to my stone-age methods (me build waypoints, me rename old file), but I'm sure there would be people who'd appreciate that feature. Good one! Let's see what our coding department says...