Agreed. Crosshotbar space is typically much too valuable to waste a slot dedicated to a single type of potion. Nearly every ability I use is macroed to one degree or another, such as combining Cover, Shield Lob, and Shield Bash into a single macro. (Target is an ally? Use Cover. Target is an enemy? If within range, use Shield Bash, if not, Shield Lob.) I would LOVE to have a /item command, to make Potions usable within macros!

And on the topic of the importance of macros when using the crosshotbar - we need more than 100 macros! After leveling every job, I have no room left for Dark Knight, Astrologian, or Machinist, let alone macros for new abilities we get on existing jobs as we level to 60!