Where to set Custom RDP settings on Server 2012 VDI Connection Broker?

In Server 2008 R2, there was a "Custom RDP Settings" window accessed through Remote Desktop Connection Manager on a Connection Broker server. See this blog post for info/screenshots: http://blogs.msdn.com/b/rds/archive/2010/04/28/customize-rdp-settings-for-virtual-desktops.aspx

I used this quite a bit to customize the RDP session offered to users through RD Web, but I can't find any place to set the Custom RDP Settings on my Server 2012 Connection Broker.

Is the only way to do this now to use the Set-RDVirtualDesktopCollectionConfiguration command in PowerShell and specify the -CollectionName and -CustomRdpProperty?

I have noticed that it's less of a necessity in 2012, as it seems to enable the wallpaper, etc. by default.