The generic page type comes with the following deactivatable options for inputs:

• alternative title and intro (including min/max-length validation)
• an image per page (including width/height validation)
• brand colors (only adjustable by admins) and a option to choose a color per page
• configuration switch to use the blocks module.

and the following modules:

• Display logic
• SortableGridField
• heyday' menu manager
• ZenValidator to validate inputs of content-editors and website users
• Inheritage of values from parent page types
• Backendmessages for message boxes.

Simply extend your custom page types of this GenericPage:

class MyNewPage extends GenericPage
{
    /**
     * here goes your actual code...
     */
}

and then your can configure

MyNewPage:
  useBlocksModule: true
  hideCMSOptions:
    - AlternativeTitle
  intro:
    minLength: 100
    maxLength: 1000
  image:
    width: 200
    height: 300

Just run:

# install the package
composer require friendsofsilverstripe/handypages

# add run dev/build
php ./framework/cli-script.php dev/build