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Jon Gorrono coded an UCD implementation of SU tool for non-administration users to satisfy Jira SAK-131: Add Role based SU security which originated from the need of IT Express support personnel to SU as UC Davis faculty for problem resolution and support. The tool was added to Smartsite v2.3.x.
The test plan, at https://confluence.ucdavis.edu/confluence/display/UCDSAKAI/SU+Tool+-+Test+Plan, covers many of the specifications of the tool's functionality. When the code was ported for the upgrade to Sakai 2.4, we discovered the need for further documentation on how to set up the SU tool on a vanilla system.