Great idea! I have a need for this right now and would love to see this implemented.

This would come in handy for me as well - have a need to run model action on page load, and like Pat said, running action on model query would cover that.

Up vote from me on this.  We end up using a Snippet that runs on page load when we need some type of action to run.  It would be great to do this declaratively on page load.