Hi:
Unless you are a SAS administrator or one of the Enterprise Intelligence Platform developers, I would not recommend customizing the Add-in for Microsoft Office before checking with these people first.
If you do not see particular libraries when you are using the SAS Add-in for Microsoft Office, it could be that the people who set up the security determined that you were not supposed to see that library. On the other hand, it could be something as simple as the administrator did not define your security privileges in the Metadata the right way.
At any rate, while the custom task is a cool idea, you would NOT want to implement anything like this without consulting with your SAS Administrator or your technical folks first.
cynthia