I think my feature request is related to the following bug:
#1654515 Feature Request: Custom post-deploy (cloud-init or preseed) scripts per node linked to tags
When I deploy a new machine with MaaS, I can paste a cloud init script and this script is executed by MaaS as the last step during the deployment.
It would be great if I could globally configure such scripts so they are executed with each deployment. This way I do not have to manually paste my script with every deployment.