Size By Speed - Minimum Scale

Perhaps I’m not doing this correctly, but it would be nice to have the option to shrink particles when they move.

Currently it seems like “Size By Speed” only makes the particles larger as they move faster and smaller as they move slower.

But if you could do the inverse of that it would be very useful for things like say a torch fire effect. So when the torch is moving quickly the flame shrinks so you don’t leave a large fire trail after it moves.