Title: this is easily done with Silverstripe. In your Page.ss file change $Metatags to $Metatags(false) this excludes the Title from being added automagically, then you can include $Title in the head by going like:

<title>$Title - Site Name</title>

Keywords and Description: Again this is easy to edit, for each page that is created in the CMS there is a tab above the page-name editing box called "Meta-data". In this tab you can change the URL of the page and add keywords and edit the description

Hi Guys,

I've added default global Meta Tags by using the Homepage Meta Tags as the default set, then only replacing them if individual meta tags are actually specified for that page. So, if most pages have no meta tags set tehn the homepage set will be used as default but if one of the pages has a different title, or description or keywords it will use them.

You can have the correct page title appear in the default set on each individual page. So, if a page has left any Meta tags blank it actually uses the default set (homepage tags) PLUS the actual page title. eg. About Us ›› The ABC Company Website

To do this you need to add a simple function to your Page_Controller in Page.php:
   function GetHomePage(){
   return DataObject::get("HomePage");
   }

Then, on the main Page.ss template call your Meta Tags like so:

<title><% if MetaTitle %>$MetaTitle<% else %>$Title &raquo; <% control GetHomePage %>$MetaTitle<% end_control %><% end_if %> </title>

<meta name="title" content="<% if MetaTitle %>$MetaTitle<% else %>$Title &raquo; <% control GetHomePage %>$MetaTitle<% end_control %><% end_if %>" />

<meta name="description" http-equiv="description" content="<% if MetaDescription %>$MetaDescription<% else %>$Title <% control GetHomePage %>$MetaDescription<% end_control %><% end_if %>" />

<meta name="keywords" http-equiv="keywords" content="<% if MetaKeywords %>$MetaKeywords<% else %>$Title <% control GetHomePage %>$MetaKeywords<% end_control %><% end_if %>" />

Hope this helps!

ps. By default Silverstripe populates the MetaTitle with the page title, so I've included the Default Title from the Homepage after it.