Complex sentence: Endorse would be the only choice (positive voting), since it's an endorsement of current wording and editors would be allowed to add or remove endorsement at any time, and endorse combination of versions (including endorsing multiple conflicting wordings).
Split into simpler sentences: Endorse would be the only choice, since it's an endorsement of current wording. Editors would be allowed to add or remove endorsement at any time, and endorse combination of versions (including endorsing multiple conflicting wordings).