I've recently had some time to investigate a possible workaround to generate clouds with the daylight system. I've now put this material onto the database under the misc directory.Its called Cloud Generator V1.0
Basically you need to create a skydome to cover your scene.The skydome needs to be mapped with its normals facing inwards.Assign a dummy texture in your modeling app to the dome, then after loading your scene into octane,attach the Cloud generator to the skydome.
Use the daylight system and adjust the time of day.
then adjust the three controls called Cloud Size,Cloud Cover and Cloud offset position to alter the type and amount of cloud and their position in the sky.
Please see screen shots below.
The system isn't perfect but you may find by playing around with the 3 sliders that you can generate some reasonably decent looking clouds.
I've also uploaded my simple test system if you want to just have a play with the settings.
CPU:-AMD 1055T 6 core, Motherboard:-Gigabyte 990FXA-UD3 AM3+, Gigabyte GTX 460-1GB, RAM:-8GB Kingston hyper X Genesis DDR3 1600Mhz D/Ch, Hard Disk:-500GB samsung F3 , OS:-Win7 64bit