Feature request: Limit fields returned from API calls

Currently when you make a request for ticket data, you get all the data for that ticket back. So if I asked for data about 100 tickets, I could potentially get 100,000 lines of JSON because it includes all the custom_fields (which can be a lot per ticket) - this is a huge amount of data to return (i.e. useless network traffic) for 100 tickets when all I want is the ticket status and priority for each ticket.

I was advised by customer support that such a feature does not exist - could we make this happen?