Change default button states?

You define the shape states (at least 3/4 InBuilt states, not the visited state) in the Object Style Manager. Object styles are part of the theme, which I always create at the start of each project. 

Each event has indeed a default action, those aree not part of the style (is only design). For the Slide events, that is 'No Action', for quiz events it is 'Continue', for the Success events of interactive objects it is 'Go to Next Slide'. Do you really need so many shape buttons? I suppose you prefer them (as I do) because they can be used on master slides, as extra buttons on quiz/score slides and can also be timed for the rest of the project?  There is no real way to edit the default command, but never found that to be annoying because most buttons will need another command or action. If you really need a ton of buttons with same command and evventually with the same Visited state, the only way is to create a first button, then use copy/paste or (better but only possible on the same slide) Duplicate.

Some blog posts:

http://blog.lilybiri.com/manage-the-object-style-manager

http://blog.lilybiri.com/responsive-projects-object-styles

http://blog.lilybiri.com/overvew-6-button-types