yw
Bsically everything that helps pressing keys for you, which do things like movement, skills, potions, seems to be restricted.
As quickslots can hold several different itemtypes it seems to protected in total. Imo potions could be removed from this protection as well. As the cooldown prevents to use 100 potions in a row via an addon you should be safe
But it would also allow an addon to automatically use a health potion if you get below a health threshold which might be not wanted, and I understand this.
I'm using Greyminds Quickslotbar, have defined the keys F1 to F4 to the most used potions and change with them infight + press the USE key afterwards.
Together with my addon FCOStarveStop, which is also able to activate different potions in your quickslots according to the location (dungeon, overland, pvp) and combat state (in combat / out of combat) this does the trick for me so far. And it got a potion reminder as well.
There is also another addon from Harven I think which is able to change the quicklots to e.g. a defned potion for stamina if your stamine gets low. Same for health and magicka.