We were wondering if having variables at the system level could be possible ?

One case we would see the benefit of this would be for Cloud Profiles for instance.
Here our current situation :
We have a private cloud and sometimes we are not 100% sure a hardware profile has enough capacity to spawn a new VM.
We have an api and could create a script to get a usable hardware profile prior to spawn a vm.
As we have multiple Cloud Profile it would mean edit and change the script in each hardware profile (which can be confusing and create errors).
If we could have a global system to store the script and recall it when spawning the VM it would be better

Thanks