For Softimage. Searches for 'Store_Color_In_Channel' nodes and adds their channels to the scene channel list.

softimage_GatherFramebuffers.py

# loop through shader nodes in the scene, identify 'store_color_in_channel' nodes,
# and add them to the scene globals. Avoid duplicate channnels.

for x in Application.FindObjects("", "{6495C5C1-FD18-474E-9703-AEA66631F7A7}" ):
    if str(x.ProgID) == "Softimage.sib_color_storeinchannel.1.0":
        chanName = Application.GetValue(x.Channel)
        addChan = Application.CreateRenderChannel("%s"%(chanName), "siRenderChannelColorType", "")
        newChan = (addChan[-1])
        if newChan.isdigit():
            Application.RemoveRenderChannel(addChan)