On the Workers page, could you add a "Total" under each column? That would essentially give me the same information I used to see on the Live stats page.
The live stats wasn't showing the total for all workers for all time. It was the total for the current round, which doesn't appear very useful. Maybe the total for the current shift does what you want? A total for all workers for all time is a good idea though - I'll add that to my TODO list.
Could someone explain what the heck I'm looking at here? Why the "?"s, and why the zero payments for a lot of shifts?
The last 10 shifts are still being paid. Since their pay rate is not known yet, they show as question marks.
Some shifts have very high pay and some have zero. If you mine 24/7 this evens out and doesn't matter. If you are mining part time it will increase your variance, causing payouts to vary a lot depending on luck.