Showing current remaining estimate on Developer's Taskboard

Hi.
I would like the postit-notes on the developer's taskboard to show a 'computed remaining estimate' and accept changes to the remaining estimate.
Currently, I have to add both the "Estimate", "Corrected Estimate" and "Effort Tracking" fields to the note design.

I would like to only show one value - something like 'coalesce(estimate, corrected estimate, effort tracking).
Is that possible?

Am I missing something here?
If I have a work item with estimate 4h and find out its really a 10h task instead, then what's the difference between inputting 10h in corrected estimate and inputting 10h in time remaining?

Thanks,
/Morten