Forecast for Profit

Forecast for Profit

Hi

Can I request the ability to be able to create a forecast for custom fields, other than for Revenue and Quantity?

I want to target the team by profit. Profit is a custom field, so I get why it's not on there, but really it's just a value field like Revenue, so perhaps we could have Revenue, Quantity, Custom, and if the user chooses to create a Custom forecast then they get to pick the custom field they want to forecast on. 

Thanks