In the right sidebar of Advanced output, I love being able to 'tab' from parameter to parameter. The current order of positional parameters is Left, Top, Width, Height.
Changing the Width and Height of a slice moves its position, so you have to set Width and Height first, then mouse up to Left and Top to put the slice into place for a pixel map.
If the order was Width, Height, Left, Top, it would be super easy to go down a long mapping list and position slices: value 'tab' value 'tab' value 'tab' value 'return.'
On projects with lots of slices (most large festivals), this UI change in parameter order would speed up data entry.