Tealium Extension

What do you mean by a Tealium Extension?  Do you want an extension that allows you to load the Tealium TMS script through Launch?  If so, it can probably be built very easily but why would you want to load Tealium through Launch?

Some customers wants to manage the tag with only one tool.

Tealium customers set the tag directory in the page, therefor it causes some trouble for managing tag.

So, they want to manage the tag with one tool.