I've used the free version RoyalTS for while. So far I like RDCMan alot. I have three enhancement requests presented in ease of implementation.
First one should be easy: Display the Comment in the thumbnail view. While the displayname could be changed to include additional info, it would clutter the tree.
Second one is to be able to list information on a group in a table format (like in RoyalTS). Some default columns would be 'Folder', 'Display name', 'Server name', 'Description', 'User name', 'Domain'.
Third one is to be able to store various system info: OS Ver, SP, CPU info, Memory, List of drives/sizes. Especially if a matching script can be run to capture that information and just copy/paste RDCMan.