Topic: Use sector/block as unit
I think it would be good to have the smallest divisible unit in gparted, that is sector.
What: most drives use 512 byte sectors, or some nearby unit in reality. This is similar to the feature fdisk -u or parted, u s.
Why: It is important to be down to the sector level if you are into RAID or partimage save-restore. These tasks require exact sizes of partitions, not plus minus a megabyte.
I can not find any tool that will shrink a partition by the sector, parted gives plenty of error messages, and fdisk tries to be smart with cylinders. gparted could be it!
Note: Numbers should obviously be displayed using thousand separators such as spaces or commas, and input should allow such characters when paste.