No. I'd call that civil war in practice. (A friend of mine who is a military historian says he won't touch the US Civil War because 'it was all amateurs and dilletantes.' Thus so. The war you just described is war as it has been traditionally fought through the centuries: round up a bunch of guys, give them pikes (or in the modern day AK47s), and tell them 'the front is that way comrade'. Think of it as War On The Cheap.
...what ever. Most of the Sebrenici dead where shown to have bullet holes in the front from distances not point blank...might as well accuse the Germans of mass murderer at Verdun.
You're partly right. I heard a presentation from an ICTY guy who said that about 1500 of the 8000 Sreb dead were considered "legitimate combat casualties," in that they were technically fleeing at the time they were shot rather than captured, and thus outside the purview of the Court. War happens. But the rest? The ones hat were captured? Check the ICTY web site for the judgment on Krstic: http://www.un.org/icty/krstic/TrialC1/judgement/index.htm.
But the Sreb dead were definitely forensically proven to be Bosniac/Muslims from their IDs and pocket litter etc. No question of them being Serbs.
Of course, if you don't accept the ICTY as having any validity at all, then there's no point arguing.