I wrote a Plugin with is able to change the post### ids to the correct multipass channels. For this you have to open your C4D file to allow the plugin to read out the renderpath of you scene. Sadly there is no way to get access to the Vray Multipass Manager so you have to check all passes by yourself.
It is nessesary that only the rendered files are in output path!
The open beta runs until 1. August 2014
Bugs: 2014 06 23 - If you change the pass order in the vray pass manager the passes won't named correctly!!! -------------- - Sometimes the names went wrong in some pass combination - should be fixed now - If render single frame avoid indexes numbers. this works only if you got more than 1 frame - r15 all passes on default enabled, r14 not - Self Illummination not self Illumination