I want to add custom NEW button on opportunity tab. I know this can be done by overriding NEW button by custom visualforce page https://developer.salesforce.com/forums/?id=906F0000000AVm8IAG
But If I do this all users will be forced to use either the standard page or the custom page. Cutsom button can be added on either Detail page and list Page.
I would like to have a another New button on opportunity tab that will open my custom page? How can this be done? How can I add my Custom new button on opportunity tab?