This mods template allows you added to the BB Code CODE / HTML / PHP function selects all the content in it with a simple button.

1. Insert javascript code into headinclude template
   AdminCP -> Styles & Templates -> Style Manager -> Edit Templates -> headinclude
   Copy and paste following js code to bottom of headinclude template :
   
   HTML Code:

   ---

   <script type="text/javascript">
    function selectAll(a)
    {
        var e  = a.parentNode.parentNode.getElementsByTagName('code')[0];
        if  (window.getSelection)
        {
            var s = window.getSelection();
            if  (s.setBaseAndExtent)
            {
                s.setBaseAndExtent(e, 0, e, e.innerText.length -  1);
            }
            else
            {
                var r = document.createRange();
                r.selectNodeContents(e);
                s.removeAllRanges();
                s.addRange(r);
            }
        }
        else if (document.getSelection)
        {
            var s = document.getSelection();
            var r = document.createRange();
            r.selectNodeContents(e);
            s.removeAllRanges();
            s.addRange(r);
        }
        else if  (document.selection)
        {
            var r = document.body.createTextRange();
            r.moveToElementText(e);
            r.select();
        }
    }
</script>

   ---

2. Insert new code to bbcode template
   ... -> Edit Templates -> BB Code Layout Templates -> bbcode_code
   Find :
   
   Code:

   ---

   {vb:rawphrase code}:

...and...

{vb:raw code}

   ---

   Change :
   
   Code:

   ---

   {vb:rawphrase code}:&nbsp;<input type="button" value="{vb:rawphrase select_code}" onclick="selectAll(this); return false;">

...and...

<code>{vb:raw code}</code>

   ---

3. Insert new code to bbcode_html template (same bbcode_code)
   ... -> Edit Templates -> BB Code Layout Templates -> bbcode_html
   Find :
   
   Code:

   ---

   {vb:rawphrase html_code}:

...and...

{vb:raw code}

   ---

   Change :
   
   Code:

   ---

   {vb:rawphrase html_code}:&nbsp;<input type="button" value="{vb:rawphrase select_code}" onclick="selectAll(this); return false;">

...and...

<code>{vb:raw code}</code>

   ---

4. Insert new code to bbcode_php template (same bbcode_code)
   ... -> Edit Templates -> BB Code Layout Templates -> bbcode_php
   Find :
   
   Code:

   ---

   {vb:rawphrase php_code}:

   ---

   Change :
   
   Code:

   ---

   {vb:rawphrase php_code}:&nbsp;<input type="button" value="{vb:rawphrase select_code}" onclick="selectAll(this); return false;">

   ---

5. (Optional) Add new phrase : If you don't want to do this step, please look at "Notes" !
   AdminCP -> Languages & Phrases -> Phrase Manager -> [Add New Phrase]
   • Phrase Type : GLOBAL
   • Product : vBulletin
   • Varname : select_code
   • Text : select all

If you don't want to create new phrase (step 5), you can search for : {vb:rawphrase select_code} and replace with select all
Next version : add new feature "copy to clipboard".