The Role of the TL

I was doing some reading on this complex question. What is expected of a TL. What makes a good TL? I was asking myself the question am I a good TL and getting right into the swing of things when bam I was brought back to reality... What is the point of deciding what is a good TL and what we should be doing when on both library listservs that I read each day I constantly read about Teacher Librarians being asked to do little extras such as supervise students or have their library staff do some laminating or counting money for the front office or could you mind a class while this teacher attends a meeting ...  or have students in the library who do not fit in the playground etc... it is ongoing and it seems no one has the answer. Hey and none of mind helping out..... but
The role of the TL surely needs to be clarified and supported by the leaders in our schools. How do we and our role in the school become respected and valued? Is it not the job of the TL to sell ourselves and what we do ... I think until we sort out those social responsibilties that come with the position all of those other expectations and roles will always take a back seat...
It is a definate cry for help? Clarification? Recognition? It is there everyday.. take a look...