It is possible to review all of the relevant cmdlets by running this cmdlet on an Active Roles Web Interface host:
Get-Command -Module ActiveRolesConfiguration -Name *web*
As of Active Roles 8.1, these cmdlets are:
Export-ARWebSiteConfig
Get-ARWebSite
Get-ARWebSiteConfig
New-ARWebSite
Remove-ARWebSite
Set-ARWebSite
Update-ARWebUISettings
For more information and examples, please see the built-in PowerShell help files for these cmdlets.