PSJumpStart.ps1xml

<?xml version="1.0" encoding="utf-8" ?>
<Types>
  <Type>
    <Name>System.Collections.Hashtable</Name>
    <Members>
      <ScriptMethod>
        <Name>AppendValue</Name>
        <Script>
            #This will ONLY work for simple content type(s)
            $key = $args[0]
            $data = $args[1]
            if ($this.ContainsKey($key)) {
                $currentData = $this[$key]
                $this.Remove($key)
                $this.Add($key,$currentData + $data)
            } else {
                $this.Add($key,$data)
            }
        </Script>
      </ScriptMethod>
      <ScriptMethod>
        <Name>Replace</Name>
        <Script>
            $key = $args[0]
            $data = $args[1]
            if ($this.ContainsKey($key)) {
                $this.Remove($key)
            }
            $this.Add($key,$data)
        </Script>
      </ScriptMethod>
    </Members>
  </Type>
</Types>