Spanish PS3 developer alegoria from DemonHades released Magic PKG v0.2 Beta at last weekend,It is a PS3 app which allows players to create PS3 PKG files.
Download : Magic PKG v0.2 Beta for PS3 / Magic PKG v0.2 Beta for PS3
Here is the quote from spanish site
We inform this new application is being developed by Alegoria to easily create PKGs.
The idea is to convert the physical format games DG HG property to run directly from the HDD without having to undergo any manager games (Multimedia).
I discussed this in beta but from DHorg want to give our support to continue developing and improving this tool that looks great