I noticed this over on fleabay
As a lot of you will know, originally for Painkiller pak extraction/compilation, commonly used by Chains/Comp mod etc, used Multiex
It seems now that Multiex has gone a step further and released a tool specifically for PK.
You can find the tool, which weighs in at ~75KB, here:
http://www.pkeuro.com/files/misc/Painfull.zip
Enjoy 🙂