Yes you can enable png alpha, it's not dependant of the exporter, it's an option of Octane itself :
In the rendertarget menu, you'll find the options that you need :
- alpha channel,
- premultiplied alpha
- and keep environnement
As I said, to enable or disable this options, it's in Octane, so you'll have to make the ocs file (using the "render still image" option, then modify wathever you want to.
save the ocs and close Octane. your alpha settings will be kept next time you launch the exporter for your animation rendering.
Titan Black + GTX 580-3go / Win 7 pro 64 bits / C4DR14 with integrated plugin / Blender / Octane standalone /
website : http://www.kiwimage.com