I've never made a movie and I'm going out on a limb and guessing you haven't either. So I'm not sure either of us is in any position to judge how much extra footage is too much.

I do know it's better to have too much footage than too little and it's probably better and less expensive to film extra footage while everything is still set up than to call everyone back in after the shooting is supposed done and they've likely started disassembling sets and actors have flown back home or off to other projects.