Managed to add gravity to only the particles being moved. A gravity daemon isn't connected to the emitter.... A gravity force is applied to only a particle above the threshold setting.
The word 'Threshold' means:
If a particles velocity is BELOW a certain amount, for example, 0.075, its velocity is set to 0. When the particle is collided with, if its velocity goes ABOVE 0.076 (1 digit higher than the primary threshold, just to be safe), a gravity force is applied to that particle.
Once the threshold got to about 0.350, there wasn't much difference between that setting and a value of 1.000.