I know many of the new Pro features like box and text shadow do not have colour template options which is not very consistent, however there is also a display bug for Box Shadow in the Header builder. You can choose a colour no problem, however the next time you enter the field it shows the defult value of rgba(0, 0, 0, 0).
I’m using Pro 1.2.4 however I think this has always been the case with the Header Builder.
