When using Remote Server Administration Tools on Windows 7/8/8.1 Pro, it is actually possible to use RSAT without being connected to a domain, for Active Directory tools at least anyway. Unfortunately you’ll need to run the application via a runas command through an elevated command prompt as follows.
runas /netonly /user:domain\username "mmc dsa.msc /server=server-name-here-or-ip-address"
I’ve also just found this that may work on Windows Pro 8/8.1, it may need Server 2012, I’ll test it this week: http://virtuallycloud9.com/index.php/2012/12/connecting-to-a-non-domain-workgroup-windows-2012-server-with-rsat-for-windows-8/
