I'm all very new to this but I'm a former trackmania united player and there were glitched times too, and they were able to clean the boards. With trackmania it was easy to see them as you had a ghost. So does WOHD so I think it won't be too much of a hard work to clean the board by looking at the ghosts if they're submitted along with the times.

Implement a validation system with that shouldn't be complicated then WDYT?