Would be a nice feature, however you may want to limit it to 1 day in time or whatever you judge is decent time for someone to actually correct a ''wrong answer''. (actually could have a lazy system where you have until time X is reached, where time X is whatever you already use for the ranking of members and considering the time of the day they log in)
- "If I understand you well, you are telling me until next time. " - Ren