Automated Impact Tracking

I'd love a way that we could specify impacts for a given opportunity and for them to be automatically logged. For example, we don't expect our goods donations team to keep track of how many boxes of donations they log, but we do know that they average at 6 per hour. It would be great if we could automatically log the impact tracking as 6 x no. of hours.

Shifts are always 2.5 hours and so it could also work if we could just set it as each shift has an impact of 15 boxes.