I would like to see a system whereby there is no single "cure disease" potion, but rather a different potion to cure each disease. Those who choose to play a healer type could specialize in curing certain types of disease.

I'd like to see a stronger emphasis on alchemy and potion-making with a focus on finding the propper herbs and other reagents. I'd like to see phases of the moons factor into some of the more tricky ones. I'd like to see the mechanics of potion making involve grinding, crushing, squeezing, boiling, drying, etc as part of the process. Even with some potentially dangerous effects if certain steps are done out of order. For example, if you grind up a reagent into a powder and pour it into another potion, it will explode, but if you pour the potion into a paste made from the powder and some water, it won't.

Stronger versions of potions should come from using the weaker version in conjunction with different reagents, or the same reagents except that to make a greater potion of healing, instead of mixing with water, you mix the reagents with a lesser potion of healing, resulting in a much more potent blend.

I'd really like to see potion making involve more than just putting this, this and this in the interface and clicking "make potion"

I'd rather it be the same as in the TES games. You find the ingredients, eat them and mix them up with other ingredients to find out what they make. All that other stuff is added fluff that doesn't have the feel of elder scrolls to me. Same for the cure diseases. Anything else is just too complicated for an MMO.

Sounds great and I agree 100%. I would like to see it extended into all crafting also to make them more complex. The more complex the better

I also would love to see the classes more complex, not just plain healer, tank and dps. Should have different types of healers like you mentioned, maybe one could be more specialized in the area of curing poisons or curses others can be focused on giving life back.