Oh one more thing I forgot before which would be awesome, liquid effects.  Might be considered a particle effect, but where you would have water in a pool splash when collided with. Or set a point of entry to where the particle would drip, like a leaky faucet that holds dynamic abilities, so that when it hit the sink it would follow the mesh towards the drain or collect in a space until it could follow to lower areas  Would be great for rivers and rain, or flood simulations. Also would be cool if you could use the force object to make it rain at angles. So if you have a downpoor of rain particles it would follow the force, to give imagery of a strong wind.