You are right, it's a good idea, I'll do that.
In the meantime, I fixed some issues in my previous packer, so here is a new version (on mega for the moment) : https://mega.nz/#!859kjABB!4wJEUBwFFOw1qJUUMEsb7r9M8isZB3J_So-6YA4YT9w
If you have not solved your problem yet, I have made an Unpacker/Packer for Rosebleu's dat files that you can download here : https://mega.nz/#!gxczBaCb!hPr10WGs3NF-YQXwWS7JoHQfXdarxZRMHvh4DbQS5HM
I could only test it on one game, so tell me if you have any issue with it.