agreed on this
I'm checking the game rn and liking it a lot so far, but much like many games of this kind I'll allways wish that more in depth/cuztomisable stuff could be made
I think the way mario maker did a lot of things (with you dropping powerups on enemies to alter em and shaking em in the editor to change em and such) is a good way to go for a lot of things
for the matter of altering behaviour more explicitedly, I think that for basic enemies it might not be a great idea unless you add some sort of visual difference; it could be good to have "boss" enemies that are specifically meant to be edited in how they work in the editor and such, that way the player allways knows it could vary
versatility is really what they should strive for, but while keeping things sufficiently consistent to not confuse newer players, and I think these would be good ways to go bout it