It would be extremely helpful to be able to add custom columns to the details view of the Viewer. Since the Remote Utilities software is focused primarily on Windows, using some native Windows resources would be hugely beneficial here. For instance, I'd like a column that I could name say "Windows Version". I could then define a custom WMI query to run against the remote host to populate the contents of that column. I could customize my WMI query to present the necessary information as I see fit; for exampte, a host running Windows Server 2008 Enterprise Edition with Service Pack 1 could be displayed as WS2k8E-R2-SP1. The point is that the data that populates the column can be customized and the addition of extra columns that display information I need to know can be created as needed.
The Viewer already seems to use WMI in the Inventory Manager, so it looks like that functionality is already implemented, but just needs to be linked.