TomG is right, select the texture tag and then "Use Texture Mode", it's right below the make editable button, and then transform as needed.
On the other hand, if you're only looking to transform one texture-map within an entire material/shader then you could try the following: texturemap -> layer shader -> effect, transform -> material channel (see attachment). But in my example, the diffuse channel and bump channel obviously wouldn't align. So this really only makes sense if you use different textures maps on one material.
Best,
Ara