Short answers to your questions:
Q: Are these "additional properties" part of the Project Properties?
A: If you select a project in the Solution Explorer, you will see the properties in the Visual Studio properties grid.
Q: By "projects explorer" are you referring to Solution Explorer?
A: Yes, sorry for the improper statement.
Q: Should I be able to find "ConfigFile, ConnectionId, Enhancing, UpdateDatabase, UseMSBuild" by searching through my solution with Ctrl-F?
A: No you are not able to do so: the specific properties are XML definitions inside the VS projects them selves. They are implemented as custom project extenders. You can unload a project, open the project with an XML editor, go to the end of the file and see the custom properties there.
I hope the provided information helps.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items