Niagara Curl Force - Random seed

Hey everyone.
Finally getting around to exploring Niagara.

I’ve done a tutorial, which sets up a nice Niagara effect that gets spawned on a key press, and the particles dissipate using a Curl Force.
This is all fine and well, but I can’t seem to be able to set the Curl Force seed value at spawn, to allow for some variation in the forces.

Any advice would be appreciated!