Insert constants with their units

Version 0.12 adds units, which is great! But if you click to add a constant, (for example, the speed of light in vacuum) only the number is inserted. I think it would be great if clicking on a constant from the constants list you get not only the number but also its units.

BTW, many thanks for this great application!

SpeedCrunch 0.12 (Qt 5.6.1) on openSUSE 42.2 (KDE:Extra repository)