In the ShaderLoader, the button “Auto-reload shader” is deactivated by default. I suggest it should be activated by default, and that an additional button should be added to reload the shader (as a bang).
In this way, one could do live-coding on a shader and then hit the button (or automate it to make the reloading fit to the timeline) to reload the shader. Of course this could already be done by just making the auto-reload button possible to automate, but in my view it would be more intuitive to have these features as two different buttons, where one is automatable and the other is not.