The unfurling feature for task URLs isn't great. It would help to see chosen Custom Fields for tasks on the board without leaving it. I don't need them in separate places on the board, but showing fields under the task name would improve flow. I use whiteboards to ideate features. Each feature ties to a goal with fields describing the problem, value and solution, etc., and I've attached a screengrab of the task preview for a comment showing what I'd like to see on the board.

Important note: having this on the board and being able to choose what fields are displayed would greatly aid my design process.