Well, there was a hot war going on in the background of TYOLD (the Konfrontasi) - the whole "Living Dangerously" line was based around Sukarno's words ushering in of hot conflict against Malaysia, UK, etc. But on the point of Indonesian Civil War - at least at the beginning of '65, there was indeed some combat between the "G30S" forces and those loyal to Suharto. I'm of the opinion that the period of combat was brief, and that after Jakarta was seized by Nasution-Suharto loyalists the casualties were very lopsided - hence, why the PKI's Central Committee-in exile called it just a "White Terror." 

But of course, however, the same group criticized Aidit for not adhering to Mao's "People's War" doctrine - so one could imagine that there were those sectors of the PKI that were spoiling for a conflict. Hence, I titled it Indonesian Civil War rather than Indonesian White Terror or Indonesian Coup - it keeps things NPOV and open to different scholarly interpretations.

By, I should point out that I have an interesting hard copy "self critical" document the PKI Central Committee published from China detailing what they perceived as their mistakes in '65 and attempts to re-establish the Party. Unfortunately, it is without copyright information printed (this was likely due to attempts to get around import restrictions during the U.S. Cold War). I am looking forward to contributing some choice quotes to round out Indonesian Civil War. At any rate, toodles.