Found a great article here: http://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_web/how-to-disable-default-gateway-remote-in-vpm-with/6d4e1090-dbfc-4474-bcaf-cf4d60d0a2f8?auth=1
Commands are:
Get-VpnConnection
Set-VpnConnection -Name "myVPN" -SplitTunneling $True