For those transformations in which we can do multiple things simultaneously (e.g. calculating three new columns at once) it should be handy to be able to move the order of the fields up and down to rearrage as new calculations are added.
Good point. Thank you for the suggestion.
I would like to add that also in the window for managing parameters, these buttons could be very handy because sometimes you define a parameter that depends on another parameter. This is only possible when one parameter is already defined above the parameter that depends on the other.
So when one wants to insert a new dependency, we need to be able to insert a new parameter in between the other ones.