My config.yml keeps resetting although I got its syntax checked.
I even tried with an "empty" config file to see what's happening. I keep getting the original file back.

Is that a bug or am I not good enought to understand how this works?

Here's the config file: http://pastie.org/6367010
Running tekkit 1.2.5-R4.1-MCPC-Snapshot
TekkitCustomizer: 1.5.2 (CB 1.2.5-R5.0)

Thank you for your answer =)

OK Got it to work, I did not know that an empty file would re-generate the whole list.