Textures/Labels browsable and manageable separate from individual materials

[sethcshort]

I'm working with several Keyshot files. I'm encountering a number of objects that have textures and labels that have been moved to a different location. The only indication I have of this is when the model doesn't appear correctly (not always easy to tell) or, more reliably, if I try to Package the file, it tells me which files are missing.

What I need is some way to see which files are missing in the main interface, and a way to re-link them easily. Or at least to see what materials the textures are in, so I can jump to the material and correct the missing texture.

Basically I'd love the equivalent of the Materials tab, but a list of texture/label files, with an indication of what materials contain each texture.
And if it could visually indicate if there are any missing textures, that would be even better.
And if it provided a function to re-link the textures, better still!

Thanks!
Seth