Maybe I'm missing something here, so correct me when I'm wrong
For 'regular' materials users have a choice if they want the .tga go onto the GPU raw or compressed. This is the normal workflow for most textures.
When the mapper wants a particular .tga be used always uncompressed, they slap the forcehiQuality flag on the material. In this case the user's preference is ignored. This flag must not be abused no matter how important the mapper considers the difference in looks. Only a handful, <1% of all materials, should fall in this category.
Do you have a lot of textures you think must be always uncompressed, no matter how slow and limited user's system is? If so, think again.
If it's just a couple of textures that you have singled out as exceptions, then use the FHQ flag and everyone's happy.