Hey, it's you again! I'd be glad to help you out again, I've thought of an idea for a mod already. I just never modded The Sims before so I couldn't make it.
As something for people who don't own any packs, you could make a mod that adds magical orbs. So if a Sim has one of those in their inventory, they can use the associated abilities. Range doesn't matter. Not usable autonomously.
Fire Orb = set the ground on fire (like fire ghosts), evaporate puddles, cook cookable objects in your inventory, just spawn a fire in their hand (maybe a new animation or something for this one; mostly for screenshots but could also scare other Sims away)
Water Orb = clean things up, create puddles, create an infinitely deep puddle under a Sim (like "drown in pee" from Book of Chaos)
Electricity Orb = destroy appliances, cause electric shocks on Sims (two shocks kill, so this is a useful weapon)
Plant Orb = Let a plant grow fruit instantly, kill a plant or only its fruit instantly, turn Sims into PlantSims (including yourself), maybe kill PlantSims (but not normal ones)
That's just some possibilities. You could put the orbs in buy mode by the way, they'd fit under "Hobbies and Abilities".
Such a mod would be an amazing addition for those who want to play with magic easily. And those who want to burn their neighbours. Guess which I am >:)