DISCLAIMER: I'm not sure I would ever do something like this. It's just an idea I'm batting around.
So, I'm still in my gaming funk, unable to settle my mind on a system long enough to get anything done. While I'm in this state I do have the occasional idea, I just can't stay focused long enough to develop it to any degree. Which is where this idea comes in.
I was thinking about some of the references to "formulas" in the First Fantasy Campaign. I'm not entirely sure how Mr. Arneson implemented this idea. Thinking about it led me to the idea that spells aren't cast in the traditional sense. Instead, they are cast from scrolls. Magic-users scribe their spells onto scrolls, to be used later. My premise is that casting takes too long to be done in the context of the game session. The whys are undetermined, but could be that magic is too powerful to be used in more than small, carefully controlled amounts. Whatever. The spell can be released from the scroll in a single round, though, since the spell and magic to power it are crafted into the scroll.
One of the limiting factors would be language. The scrolls would have to be written in one of several specific, and dead, languages. I'm thinking eight languages because it is a decent enough number to work with, and easy enough to randomize. That would give an extra, and more immediate, meaning to the Bonus Languages column under Intelligence.
Potions would get a similar treatment, allowing a different sort of thing. Maybe some spells are better suited, or even restricted, to one medium or another.
Obviously, I don't have the mechanical details very well thought out at this point. This is an idea I like, though, and this doldrum I am in has made it difficult to work up enough enthusiasm to post about anything. So, here it is, an idea in the rough. Hopefully I can put some meat on the bones as the week goes on.