Many other monsters do appear to use some sort of UO: Third Dawn "3D" sprites too. Giant Serpents for example. FYI, elsewhere, I also made a feature request about tracking to be able to see more than 12 options (three rows of four). And to have the words and cardinal direction of the prey appear above your head when you track.
This is currently on my todo list. However the issue is that not all monsters have mini statue versions to use on the gump. So any suggestions about surrogate images to use available in the 5.0.8.3 client would be welcome.