Two system fields for tracking time

It would be really powerful to be able to have 2 different time tracking fields on all our cards—one for our “SWAGs” (the estimate before the estimate) and one for the real time estimate once the user story is defined in much more detail. This way, we could compare the two on a periodic basis and see how we are doing in "SWAG"ing our work. The reason a simple number value custom field isn’t ideal is because we also really need to aggregate these fields at a higher level (e.g., master feature) to better be able to forecast and project an entire feature set of work. The current system field for time tracking is great but it would be even better to be able to have 2 of them.