Yes you may do so without your spouse.

Indicate the Canadian visa for I94.

You can try but generally this isn’t a basis for expediting.

You should attend interview but consult with an attorney prior to doing so.

Consult with a tax professional for guidance.

A waiver would be necessary given specifics of case.

Consult with a criminal defense attorney for guidance.

This does not appear to be an arrest for this purpose.

Depends on the country requirements for visa. Consult with a specialist for guidance.

Obtain a FOIA record of case history.