PLEASE YES.

It would be lovely to be able to include potions in our macros. Right now, they are cumbersome to use with a crosshotbar; you just don't have enough space to waste an entire hotbar slot solely for the use of one type of potion.

If this option was once available, and has since been removed, it simply boggles my mind. I can't imagine that it would cause balance issues, and as it stands potion use is cumbersome at best.