Hi!
I don't have much experience playing CAR on HAN, so i don't know first hand if the gallic remplacements events are enough or not. I guess it depends of how bloddy are the battles fough in each game...
But the other day i loaded the files Dortumund posted here
http://www.ageod-forum.com/showthread.php?39380-Game-not-recognizing-orders
of another PBEM game of his and noticed that the CAR gauls were nearly non existant on that game after heavy fighting with the romans because of the lack of reemplacements.
Hannibal was still trapped on Cisalpine gaul, but his army was nearly fully made of africans and hispanic troops, which could recover losses while the local gauls couldn't.
In any case, IMHO and don't think there is much historic reasons for making CAR gauls reemplacements be just "by event" volunteers while CAR can normally buy reempalcements for his hispanic allied tribes or, latter on, for their italian allies. Specially when SPQ can normally recruit replacement for his allied galic tribes.
Regarding the free replacements events, is there an easy way of desactivating them now we can buy gallic remplacements? I guess having both free by event and normal remplacements may be too much advantage for Hannibal...
Regards!