I just recently "discovered" that when the
inject node is running in its Repeat mode it can still be triggered by clicking the button in the editor. Neither the documentation page nor the help text in the editor quite made that clear to me. Of course, it could be that my reading skills are the issue, but this is such a useful feature that I think it should be spelled out more clearly. I would suggest adding the phrase in italics to the help text:
By default, the node is triggered manually by clicking on its button within the editor. It can also be set to inject at regular intervals or according to a schedule, while still responding to the button.