In various onet.xml you often see the two publishing features with the following property SimplePublishing set to true.

The advantage with this is that you don't have to go through the Approval workflow for every page that is going to be published. The disadvantage is that you lose the ability to schedule pages for later publishing and how long they should be published.

The solution to get the best of both worlds (scheduling but no approval workflow) is to change the site definition to this instead:
<SiteFeatures>
        ...
        <Feature ID="AEBC918D-B20F-4A11-A1DB-9ED84D79C87E">
          <!-- PublishingResources -->
          <Properties xmlns="http://schemas.microsoft.com/sharepoint/">
            <Property Key="AllowRss" Value="false"/>
            <Property Key="SimplePublishing" Value="false" />
          </Properties>
        </Feature>
        ....
</SiteFeatures>
<WebFeatures>
        <Feature ID="22A9EF51-737B-4FF2-9346-694633FE4416">
          <Properties xmlns="http://schemas.microsoft.com/sharepoint/">
            ...
            <Property Key="SimplePublishing" Value="false" />
            <Property Key="EnableApprovalWorkflowOnPages" value="false" />
          </Properties>
        </Feature>
        ...
</WebFeatures>

Have fun,
Niklas