hmm.... Chad could get industrialized by gaddafi, then once his empire starts to crumble, turn on him and declare independence, and then you have a more industrialized and modernized chad.
Honestly,I think there would be a lot of upset Chadians. Plus any Anti-Gaddafi rebels would get some more hiding spots during the civil war and the French will probably be more active in backing Anti-Gaddafi resistance along before the civil war.
Now,taking the Aozou Strip is another thing. If Gaddafi just wants that and gets it,then Chad will be annoyed but they won't really be able to do anything without France's help.