yes, I thought about miniatures earlier and even tried to make them, but I didn't quite succeed.
In fact, BAM already has some secret function for showing thumbnails ;). I did not specifically describe it because the thumbnails were not updated, although it seems to be working after my last fixes, or is it because of the new version of blender 4.3, but perhaps also because of the Cycles render.
If you hold down Alt+Ctrl and click on the thumbnail of the material, an expanded window with a large thumbnail will appear ;)
Would be great to add the preview thumbnail to the material and convert them in materials assets with the thumbnail too ;)