a mod that changes the game's fundamentals?

Sorry, not sure if I'm allowed to WCIF here. So basically I'm looking for a gameplay mod that stops Sims from doing absolutely anything in the proximity of another Sim.

To elaborate. I had a Sim just returned home from traveling. The daughter was swimming in the pool, a random task assigned by the game. I commanded my current Sim (the dad) to go talk with his wife in the kitchen. So what did they do?

They both go ALL the WAY to the pool, change to swimsuit, dips in the pool, and talked there. Like... why??? Just talk in the kitchen! This was notorious with eating, still is to some extent. 

It's infuriating sometimes not to mention that Sims rarely do what you tell them to. Most of the time the task fails not because of routing error or whatnot. I doubt such mod is possible but maybe I'm wrong.