[...]the last time I searched the net for MD2 tags and Blender I found very little[...]
maybe that because only ufo:ai supports tags for md2 models
tags are in general part of a md3 model.
i can't think of other models that could use trees - as trees are currently the only animated-multi-level-models - for static models tags are not that important.
a tutorial about tag files would be cool. thank you very much.