Many in depth questions regarding riots. Please help!

[BeeDee10]

Not quite the only thing; having troops on your planet also helps. From the happiness file for neutral happiness type:

New Treaty Non Intercourse := -100
New Treaty None := -100
Our Troops on Planet := -2

(negative values increase happiness).

This is the same happiness increase from troops as for the Peaceful happiness type which I usually use, and I find that a good squad of troops can do wonders.

[Puke]

yeah, and thats a per troop per turn bonus, so if you have 20 light troops with nothing but a cockpit (i call em riot police) thats 40 points of happyness. every turn that they are there. over a year, thats 400 points.

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"...the green, sticky spawn of the stars"
(with apologies to H.P.L.)

[Q]

To choose "neutral" as happiness type is just suicidal! Your population gets even angry about new colonies. Neutral is a bad description of this happiness type, xenophobic would be much more appropriate.
If you want to use this happiness type you should modify it.