new hook for workbench_moderation_revision_access

Hi,
it is possible to have a new hook_workbench_moderation_revision_access for managing the access rules to view/revert/delete revisions?
I try to add a hook in the function _workbench_moderation_revision_access
Before the "return $access", I add

  drupal_alter('workbench_moderation_revision_access', $access, $node, $op);

Could it be usefull for the workbench moderation solution?