To set a few things straight or at least add additional information as well as my opinion on the matter.
As far as I am concerned as well as most historians in Croatia (though that stance is not widely accepted) the war in BiH had two starts. The first one when local BiH serbs and JNA devastated the village of Ravno in their attempt to completely control the hinterlands of Dubrovnik - this happened at the begining of october 1991. The fighting between local BiH Croat forces and local BiH Serb forces and JNA spread across BiH with heavy fighting west of Livno and aroud Kupres. BiH Muslim (from this point on Bosniaks) join local BiH Croats in resisting local BiH Serbs and JNA. This continues until the Bosniak-Croat conflict with as much as 1/3 of "Croat" forces being made of Bosniaks. The second one is the international date od March 1st when the Bosniak leadership lead Bosniaks start fighting against BiH Serbs and JNA. That date is nonsense since the fighting had been going on for 6 months by then. In addition the fighting in BiH during autumn/winter '91-'92 is the reason why southern Dalmatia remained under Croatian control, in a way the fighting in BiH was crucial to Croatia's survival.
As to how can Serbia (not Serbs) win the war in BiH. The anwser is to actually fight in it from the start. JNA + local Serbs failed to "win" in Croatia due to the collapse of recruitment in Serbia during late summer and autumn of '91. Less than 10% anwsered. A big thank you to my eastern neighbours to resisting the maddness that was sweaping the land.
If they do mobilise even with just 40% anwsering the call the war in Croatia is mostly a foregone conclusion. Even with the level of casulties sustained at Vukovar, Osijek, Vinkovci, Đakovo and rest of eastern Slavonia would fall, by Februray '92. The JNA + local Serbs had a huge advantage in war material, what they lacked was manpower. By December '91 the situation in the field was allready 3:1 in favour of the Croats while "Serbs" had (roughly) 20:1 advantage in tanks and armoured vehicles, 15:1 advantage in heavy artilery, 10:1 advantage in light artilery, 200:1 advantage in aircraft and 45:1 advantage in ships.
With the upsurge of men to support existing material Dubrovnik and Zadar are destined to fall by December '91 with central Dalmatia and western Herzegovina cut off from the rest of the country. They would also have sufficient forces to press their attack on Karlovac and quite likely take it by February '92. Reaching Zagreb from that point could be possible by April/May '92 after some vicious fighting and with willingness to suffer casulties needed to break the Croats. The conquest of Zagreb would probably requier an additional 10-15% recruitment.
Unless the Bosniaks join the Croats in fighting the Serbs during the late autumn/winter of '91 any rebellion at a further point in time would just be a suicide. So that is one way to "win" the war in BiH.
If the situation follows OTL until March 1st '92 Serbia/JNA can win the BiH conflict by going for the land rather than the "landmarks" strategy. In reallity not repeating the same mistake they did in Croatia in '91. If JNA + BiH Serbs just surround Sarajevo instead of expanding serious effort early on to actually take the city they can concentrate on more important goals.
1) Secure the Drina vally - as in OTL but try and do it with less brutality so as not to atract the attention of the western press.
2) Put preasure on Posavina but actually try and break south of Tuzla to divide the Bosniaks and turn the northern Bosniak forces into an appendix of Croatian forces in Slavonia.
3) Secure the Sana valley.
4) Ignore western Herzegovina and central BiH inhabited by Croats since those areas are sure to recieve assistance in material and volunteers from Croatia proper where the main body of fighting had died down.
5) Put preasure on Cazinska Krajina and the so called Bihać pocket to fill in the hollow area in the western serbian lands. All these goals are achiveable by August '92.
6) Frieze the front line and call the EU/UN to the peace table, initiate the talks make yourselves look like peacemakers.
The negotiations would start with the front line going something along these lines. In my opinion a total pawnage of their opponents as far as Serbs are concerned during the shorth but brutal war of "Yugoslav seccession"