When I set a particle system emitter as disabled, e.g.:
ParticleEmitter emitter = ps.getEmitter(0);
This this is ignored when I invoke ps.update() and ps.render(), thus the emitter is updated and rendered despite it's status as "disabled".
I wanted to create a ParticleSystem for a damaged unit in my game. It would have emitters for "sparks", "smoke", "flames", which would get activated depending on the damage level of the unit. But enabling/disabling individual emitters is defunct.