Allow KPI cards to be edited

[DavidSmith]

I like the visual aspect of KPI cards, but I found myself recently wanting to edit the value as part of a what-if analysis.

I used KPI cards to display the assumptions , but I wanted to flex one assumption but I can't edit KPI cards.  The resultant grid input just looked out of place

[PhilCatterall]

Could you use Fields for this instead? Not as nice looking as a KPI card but a lot better than a grid for this.