With the availablity of OEMConfig compatible apps from different Android-Enterprise device hardware vendors,  there is possibility that some device Settings parameters can now be configured via MDM/EMM/UEM solutions such as Soti MobiControl.  This should be the trend and the probability of achieving the same configuration with Mobicontrol script is getting less likely..

To make the dynamic and indpendent control of Settings available for your device brand, do not include apps other than OEMconfig app in your app-catalog rule for each group of devices using the same set of configurations.

Using this mechanism, there is no need to ask MDM vendor which parameters can be configured onwhich brand or which models.  Instead, ask the support team of the hardware devices you are using, and they can provide fixes and/or new features with updates in their own OEMConfig apps.

However,  I have just checked the latest OEMConfig app from Unitech.  There is currently no option to change camera storage location.  You  have to contact Unitech to request for a new feature in their app.  Before a new version is released, I beleive your only option is to use a third-party camera app with such control via AppConfig framework, or which has been hardcoded to use your desired directory if the app is open-source.