Wanted to jump in and ensure we set some expectations around RDG and session timeout. It is a feature we would like to address in the future, but do not have a definitive timeline for beginning development.
To set some context about where we are today, we previously attempted to add this feature to our RDG application. The implementation did not work consistently and will be removed from the product in a future update. In the meantime, we continue to work to address this feature in the correct manner.
This may not be the answer you would like to read today but any registry setting to alter default timeout behavior may break in future updates and in its current state is unsupported.
We ask that the registry setting not be shared as this is an unsupported configuration and may result in unexpected behavior.
If you are looking to be added to the feature request around this, as @DuoKristina said please contact support and they will be more than happy to help.