I am making posable molecular models for work, and in the course of that I have got away with text-editing various sorts of strange matter into pose files: materials, channel names, and "bend 0". But I would like one thing: instead of having to make e.g. three separate pose files "trans", "gaucheplus", and "gaucheminus" (this refers to rotation at bonds between atoms) separately for every link in a long chain molecule, it would be useful to have a "relative" sort of pose file that could be applied to any one segment, and it could pose that segments, and its parent and grandparent etseq if necessary. Each atom is a sphere; the atoms are not welded, merely overlapping. I find that translating the phi file automatically puts each segment's joint-center at or near the geometrical center of its parent :: that is useful.

that's one big-*ss molecule (no help, sorry; the 0 replies bothered me)

"bend 0" in CR2 language means that that segment is rigid. If that segment can bend, it would be "bend 1".