Arbitrator-initiated motions, not specific to a current open request
Dispute resolution requests (WP:DRR) provides a central compilation of and an easy-access overview of noticeboards for dispute resolution, and details the various different methods used at each of the Wikipedia dispute resolution pages.
Remember: All content and conduct issues should be discussed at either the article or user talk pages before requesting dispute resolution.
Apply to the Arbitration Committee for an examination and binding decision regarding a long standing issue of mis-conduct after all other avenues of dispute resolution have been exhausted. Or request enforcement against a user who you feel is acting in breach of the remedies described in a closed arbitration case.