To add a separate button for the Time Slider in the toolbar instead of or in addition to the small button in the lower right corner of the map screen, a generic tool can be added which points to it via JavaScript entry.

For this purpose, create a custom tool in WebOffice author standalone > Tools.

Specify the URL of the external page: javascript:(a=function(){client.api.openTimeAwareness();})()

The tool icons for WebOffice core and WebOffice flex client are to be adapted if necessary; e.g.: "pub/images/timeslider.png"