You could do this with EC2 Run Command if you have that agent installed, though it may be a better fit for something like a Cloud-Init configuration that you put in the user-data for each instance.
Alternatively consider using AWS OpsWorks to configure the nodes as desired at boot time, or generate a golden image with Packer such that the config is placed at build time instead of boot time.
Configuring 150 nodes via cluster-ssh is a recipe to have inconsistencies in all your nodes, and will be a hassle if one of the nodes needs to be replaced / reprovisioned.
Ansible, Puppet, Salt, CFEngine are other tools that can do this, but not 'interactively'.