Things like the genies in the following screenshot are possible now:
You can have a static number of particles in a particle system now. Their energy is always alternating up and down, but they don't dissapear. ( make noEnergy / Energy the same if you don't want this alternating thing )
in the xml its marked like this:
...
<static-particle-count value="1" />
...
the particles have no more movement! So speed, gravity and direction doesn't matter.
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Another thing I did was making the emissionrate a float value, which allows values <1 now like 0.01 for example. This will allow a particle system that only emitters a new particle every 100th update step.
...
<emission-rate value="0.01" />
...
example for the static-particle-count
These particles effects are not set in the official megapack data yet, But I hope to do that soon! So if you want to see it you have to make the changes on your own ( at the moment )!