Ability to put in negative numbers in LEADING (OMNIGRAFFLE calls it LINE SPACING)

Hello All!! So I use labeling inside very small boxes, where I would like to adjust negative line spacing available ( IN PRINT WE CALL IT LEADING). BUT, I would love to be able to put in a negative number in this field to bring the lines closer together. Would this be a feature request? Thanks for any help!!

Probably would be good to do. At least then it will be a visible request.