I have lots of gadgets but not a bread machine, so I'm unfamiliar with modifying recipes when using one (if you even have to). For curiousity's sake, I checked allrecipes and found this recipe for making banana bread in a machine:

http://allrecipes.com/recipe/banana-bread---quick-bread-for-machines/

Ingredients are kind of similar to the recipe I posted before with some modifications. Decent reviews.