I am playing classic sod.
I want to down rank spells for mana efficiency.
So I want to use the druid spell "Rejuvenation(Rank 4)" which is spell id 2090.

If I enter 2090 in click castings as a spell and save it, it seems to have the same effect as if I enter 774 or 9841.
It always casts the highest rank I know which is "Rejuvenation(Rank 10)".

If I make a macro, it will cast the correct spell, however it is a pain to have to setup macros for all the classes I play.