function Set-SitecoreConfiguration {
    [CmdletBinding()]
    param(
        [Parameter(Position=0, Mandatory=$true, ValueFromPipeline=$true)]
        [ValidateNotNullOrEmpty()]
        [string]$SitecoreHost,

        [Parameter(Position=1, Mandatory=$true, ValueFromPipeline=$true)]
        [ValidateNotNullOrEmpty()]
        [string]$User,

        [Parameter(Position=2, Mandatory=$true, ValueFromPipeline=$true)]
        [ValidateNotNullOrEmpty()]
        [string]$Password
    )
    $URI = $SitecoreHost + "/sitecore%20modules/PowerShell/Services/RemoteAutomation.asmx";
    $GLOBAL:SpeRemoteProxy = New-WebServiceProxy -Uri $URI
    $GLOBAL:SpeRemoteUser = $User;
    $GLOBAL:SpeRemotePassword = $Password;
}

#Connect to SiteCore utilizing function above
Set-SitecoreConfiguration –SitecoreHost 'http://sitecorehostname' -User 'Admin' –Password 'b'

<sitecore>
  <powershell>
    <services>
      <restfulv1 enabled="true" />
      <restfulv2 enabled="true" />
      <remoting enabled="true" />
      <fileDownload enabled="true" />
      <fileUpload enabled="true" />
      <mediaDownload enabled="true" />
      <mediaUpload enabled="true" />
      <handleDownload enabled="true " />
      <client enabled="true" />
      <execution enabled="true" />
    </services>
  </powershell>
</sitecore>