All delegates have full and equal rights of participation. Right now, most General Conference business is actually United States business. International delegates sit through it and cast votes, but the decisions don't really affect them. The General Conference guards the church's historic position of firmly upholding biblical absolutes, allowing freedom in areas not clearly mandated by Scripture, and encouraging tolerance and unity when differences arise. This statement is taken straight out of the current UB Discipline.
National conferences can appeal such actions.
The Constitution only makes allowance for disciplinary action. Any details should be put in the by-laws. The General Conference accepts national conferences into the membership of the Church of the United Brethren in Christ, International. Again, the by-laws detail the process for accepting national conferences. The General Conference considers amendments to the international Constitution, Core Values, and Bylaws.