I do not understand this hype about weight painting. From a mathematician's point of view, the falloff-zone poser uses are clearly the more general concept. With them you can easily differentiate between the geometry of the mesh and it's topology, with weight painting these are tightly coupled. Meaning: when you cut off your V4's arm and redo it in a modeling application with a different topology, you can still use your falloff-zones, but your weight-map is gone (because the weight-map is based on vertex-numbers, while the falloff-zones are based on location in 3-dimensional space). Also, if you absolutely need the weight-map, you can use your falloff-zones to create one, while the other way around is much more difficult and likely to result in one falloff-zone per vertex. The falloff-zones essentially say something like "the vertices around [origin of elbow here] are effected by bending", where the weightmap says something like "vertex 7,8 and 9 are effected by bending" the latter being far less useful for different figures than the former.

And what is the plan to actually create the weight-maps? Sure, one can export collada, from eg. wings or blender, but as long as one cannot do the armature animation within the same program as the weight-painting, the process would be rather uncomfortable (except for big fans of poser's group editor of course).