Interesting. Now that I think about it, these flags may have more to do with Conversion Tools and how it selects the format when converting the associated Targa image to .dds. If I'm not mistaken, the nocompress flag would output an 8.8.8 (RGB) or 188.8.131.52 (ARGB), whereas the usage tsnormal would output DXT5_NM (XY) or, in combination with nocompress, 8.8 (XY). To reconstruct the flags accurately, you could interpret the resource format of the dds
for each tobj, as well as its usage in the material.
It would be extraordinarily unlikely that 184.108.40.206 or 8.8.8 — and relatively unlikely that nomips — would be used for tsnormal. It's likewise unlikely for 8.8 to be anything other than tsnormal + nocompress or to find any tsnormal resources in \\material\ui\. Hopefully this helps to build a case structure.
Of course, I don't think these flags are necessary for resources that won't be converted. They would
be helpful for anyone who intends to replace or copy such resources if they are to be processed by the conversion tools. I'm not sure how much we can expect modders to understand how all of these files interact through the conversion process.