Hi, we already have a feature to save cxr without the elements logged in our internal tracker. It seems that this is especially problematic for the users when rendering through 3rd party managers like Backburner or Deadline.
I am not sure how much Backburner can be manipulated, but if this is helpful in any way to you, you can:
1) Override the file output path through maxscript to make it empty: rendOutputFilename=""
2) Use CoronaRenderer.CoronaFp.dumpVfb "c:/yourfilename.cxr" maxscript command to dump the cxr file without extra render element files
We are planning to implement an elegant way to do it at some point (probably similar to what V-Ray has).
As to the Rebus question - you should probably contact Rebus about it. If you wish, you can send us a support ticket to support@corona-renderer.com , and we will contact Rebus on your behalf.