Photo "Plan B" interim results

Have got some terrain following photo scenery working.

http://freespace.virgin.net/mamaloucos.circus/Flightgearweb/index.html

I have noticed Terragear doesn't know that Flightgear doesn't care about
material names. I created /data/Textures/Photo and added 20 new photo
images (made with chop.pl), each with their own material name and
details in materials.xml. Flightgear is having no problem using them.
However tguserdef seems to need the material name to be one of the
standard Flightgear materials. So the only way I can assign the photo
images to the scenery squares I have made is to use Flightgear Scenery
Designer to do it after I have built the .btg files (this is very slow).
Is there a command I can pass to tguserdef to allow it to use any
material name, or can I modify it to not care ?

I am quite happy with the results given they are a prototype, but am
getting annoying creases in the terrain where the "photo squares" I have
made join. Does anyone have any ideas on how to stop this ?

Needless to say having a lot of fun, would appreciate any comments on
the above.

Mat Churchill