Uncertain Spell Research
Thanks to ShockMeSane for the idea
ShockMeSane had a great idea over in the General forum: research results in a chance to learn a spell, rather than a guarantee. I'd like to see this further expanded by borrowing from MOO3, and have research slide. Sometimes you can get a spell at Level 2, other times Level 4. What might be interesting is to have the chance to get a given Spell increase with Research Level, but never be 100%.
Example: Nature's Pity is a mass healing spell. For every level in Life, you get a 5% chance to research it; for every level in Water, you get a 1% chance to research it. You get to "roll" to get the spell every time you increase your highest level between Life and Water (or, perhaps, every time you increase either).
Even having the ability to configure (i.e. mod) this behavior would be nice, even if it isn't used by default.