My ex-husband signed his rights away but must pay child support. He also has an 18 year order of protection against him

question not clear, if his rights were terminated then he does not have to pay support.

Can a Hearing Officer at hearing act as a mediator with pro se litigants?

Yes you are correct the hearing officer is not a mediator.

You have to file a motion to vacate the garnishment order.

If I hear a rumor that my ex may be making more money, can I see if I can get more child support?

First you should subpoena his pay records. You do not go to court based upon rumor.

Is it at all possible to get a retroactive child support modification decrease? Special circumstances explained below. THANKS!!

You get relief from the day you file a motion. Unless your ex will agree to stipulate to reduce the support arrears.

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Can I have my wife arrested?

If she assaulted and battered you then yes she should be arrested.

I am still married to my wife but we have both been living apart for the past 10 years...she filed for child support against me?

If you have minor children not living with you then you have to pay child support.

I was denied access to my daughter at school (2nd grade), with me having a court order in-hand, whats my recourse?

Get a certified copy of the order you have. Also file a motion for contempt against your ex, she is violating the order.

Ex-Husband scammed the court, and now has refused to comply with the separation agreement. What options do I have?

You will have to get a lawyer on the case. Sounds like he committed a lot of fraud here. You will have more litigation and more motions to file

They are going to close the case and dismiss the case.