The dump and resume process works as follows: If the option is turned on, the current rendering is saved to a file with the extenstion „dmp“. You can interrupt the rendering and leave maya. If you now want to continue the rendering, open the scene again and turn on the option. If you now render again, the „dmp“ file is loaded and the rendering contiues from this state. At the moment the „Dump Exr File“ has no functionality yet, the saved file will always have the same name as the normally rendered image file, only with the „dmp“ extension.
Checkbox for renderstamp in file is implemented and will appear in next release.
Bump will be implemented as soon as it is available in the API. My own implementation would not be very efficient so I wait because Ondra will implement it in the API for the standalone renderer anyway.
Thanks for testing.