ORIGINAL: Lucian
It would require very little extra game logic because the explorers would just be re-doing the exact same thing they did first time round except this time they would put a second tick against their check list......and then an third.... and so on.
I'd be thrilled to simply be able to assign explorers to "ruins exploration" mode. So they pop into a system, and if there aren't any ruins - just leave. They only go to planets which have ruins to explore - they don't explore the gas giants for resources or such. It would be one work-around for the current bug where explorers miss ruins.
Supposedly explorers are working fine....