There are additional MW hooks available:

'BSStateBarAddSortTopVars': Use this hook to add sortkeys for statebar top elements.
$aSortTopVars: Array of existing sortkeys (sorkey => sortkeyI18N)

'BSStateBarAddSortBodyVars': Use this hook to add sortkeys for statebar body elements.
$aSortBodyVars: Array of existing sortkeys (sorkey => sortkeyI18N)

'BSStateBarBeforeTopViewAdd': Use this hook to add additional elements to the statebar top area.
$statebar: StateBar object from BlueSpice MW
&$topviews: Array of ViewStateBarTopElement objects

'BSStateBarBeforeBodyViewAdd': Use this hook to add additional elements to the statebar body area.
$statebar: StateBar object from BlueSpice MW
&$bodyviews: Array of ViewStateBarBodyElement objects