(OP is referring to http://www.silverstripe.org/Latest-Pages/)
In the widget, the controller DataObject::get currently finds 5 results. Change the '5' to '2' and you've sorted one problem. You'll also want to make sure it only grabs the articles from certain sections, so add ParentID = $this->ID or whatever you need:
$pages = DataObject::get('SiteTree', 'ParentID = '.$this->ID, '`LastEdited` DESC', '', 5);
For issue two - showing a brief overview - you need to edit the template. In the control the anchor tag currently shows <span>$Page.MenuTitle</span>.
You will need to add $Page.Content or $Page.Content.Summary wherever you want it.
Hope this helps.
Edit: re-read what you said and adjusted accordingly