I'm actually new at this stuff, but hopefully this helps.
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**One Shoot** = turn off **Looping**
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**Autodestuct** = create a new Javascript, and attach this to your particle
#pragma strict
function Start () {
}
function Update () {
if (!particleSystem.IsAlive()){
Destroy (this.gameObject);
}
}
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**Tangent Velocity** = I *think* you can get the same effect if you mess around with **Shape**, which is in between "Emission" and "Velocity over Lifetime", as well as messing around with the **Start Speed**
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Good luck!
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