I'v got something it's old, 3.5 I think, but might still be usefull.
These two optional strings go on the end of the the $section: bits.
+Tile Factor: 35.0, 1
This has two values the first is the tile factor the second is the tile type. There are currently 3 types,
0 absolute: the texture will tile 'tile factor' number of times no mater how long the beam is
1 relitive: the texture will tile based on the length of the beam
2 fited relitive: a better implementation of the relitive tile type, were factor of 1 will tile one time factor of 2 will yeild 2 tiles ect... and adapt to beam length
+Translation: 2.0
this is how fast a beam section will move, the values are reversed to what you would think so this value would apear to be moveing tward the base
rather than away from it
Again, I'm not shure this is correct, but it's the only data I have. hope it works.
edited for typos