I'm afraid the "hot spot" areas of a rollover image, basically the box shape containing them, are stuck being square or rectangular in shape. I don't think there's any way around that, at least not within Muse. Someone rolling their mouse over one of the invisible corners of an Octagon shape will trigger the rollover image to appear. The only way around that I can think of around that is nesting a smaller "trigger" box inside the area of the Octagon to trigger changes in a slide show or composition widget. The downside with that approach is parts of the Octagon shape will be dead; only the center would be active.
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