question: multiple life stages for behaviours, non-uniform scaling (radius)?

[riveranb]

This is a great particle system tool. Here I wonder if I can do something with nebula?

1. multiple stages on life for a behaviour: (for example)
   behaviour: {
   life: [2, 2, 2], // 0 - 2 secs, 2 - 4 secs, 4 - 6 secs
   // for stage0: 1->3, stage1: 3->0.2, stage2: 0.2->1
   behaveA: [1, 3, 0.2],
   behaveB: [3, 0.2, 1],
   easing: [ .. , .. , .. ]
   }

Is this possible?

2. can I animate particle's scale/radius with non-uniform scaling? I observe current 'Scale' behaviour can mutate particle's scale uniformly.

3. Is there a chance to reuse a 'System'? Create a system by fromJSONAsync(), and control system.emit() at sometime, and after it ends, keep it and try to restart emit() again in the future? Cause I found out currently after system is dead, the emitters are all dead and destroyed.