If you have no alternative, I will follow this guidance and move on to the end user, who when he needs it, will always have to do this.
I'm cuurently unaware of an option do do this from the GUI.
I created a datastore with 10G, it was unnecessary right?
A datastore with 1G would be enough, right?
Yes (almost) to both. The mapping files will only consume a few kB, and since you are using RDM in physical mode, they will be excluded from snapshots.
Note that unless I missed a current change, the minimum VMFS datastore size is 1.3 GB, but a minimum of 2GB is recommended.
André