To the OP and Swiss,
I'm not privy to the Susi operation outside of Papua but I can say that what they do in Papua is bush flying. Admittedly the amount of unpaved runways is getting fewer and fewer but what you land on doesn't necessarily define what type of flying you do. Many of these "paved strips" are in some very challenging locations.
The near total absence of ATC, weather that changes frighteningly fast and the lack of infrastructure makes operating here very difficult sometimes. This is the reason I would label it as bush flying.
If mightyduck is serious about coming to Indonesia all I can suggest is to apply to Susi. You won't get to Papau straight away if your successful but you may not want to come here once you see the rest of the country. Don't take that the wrong way, I like it here most of the time but its not everyone's "cup of tea" if you know what I mean.