While I really appreciate the fact that in MM3 you have the spell names spelled out so you no longer have to remember the number of each, it has become very slow to cast them.
In MM1 and 2 you can cast them quickly by typing e.g. C34. Now in MM3, unless you want to cast the same spell you cast last time you have to click new, scroll till you find it and then click cast again. Are there any keyboard shortcuts to make this much faster?
When you want to choose a spell from a longer list, you can press the number next to it, as soon as it appears in the list, to highlight it directly, then press C two times to cast it.
In combat or while walking you can re-cast the spell you cast before simply by pressing C two times.
Other than that there are no shortcuts I know of.