If you want to publish multiple "posts" on a static page, using a standard Pages Index gadget, you just edit the static page as required. That gives you multiple "posts" that never appear in archives or label retrievals, or on the main page, on one true static page.
If your need for a "static" page is simply to have a collection of "posts", linked from a tabs index, make a custom pages / posts index gadget, and index label retrievals. This gives you multiple posts that will initially appear on the main page, and on any number of dynamic indexed (archives / label retrievals) pages.
Continuing my "Contact" example from Static Pages, With Multiple Posts, I can publish any number of individual posts using the label "Contact". Then, my "Contact" tab uses a label search for "Contact" as the target, replacing the URL for a static "Contact" page.
Any time that I need an additional post published on the "Contact" page, I just add the "Contact" label to the post, publish the post, and there it is.