How can I set up an image banner to be able to manually advance through images as well as keeping the auto advance and transitions if the user does nothing!
Well, here's half the puzzle...
...that shows how to add keyboard controls and on-screen controls to a banner-like project. From there, you have two choices. If you don't like to code, you could simply just add a timeline action. At say the five second mark, just load the next scene.
But if you want something more dynamic, you could use JavaScript to load the scene. You could use the setTimeout and clearTimeout methods to manage the counter...
When a scene is loaded, clear the previous timer and then set a new timeout.
It sounds like the type of interactive you are looking for is a carousel? If so, I think there are a few other examples as well on these forums when searching for that term.