yes vs will have an issue copying lib files because they are not in the project folder. they are added to projects using a filter which doesn't specify a path to enable paste.

vm prob needs a bit of work to enable it to auto detect new files but if toggling all files off/on works then that is probably best for now. 

as an alternative you might be able to add your own c++ project that simply contains the library you are working with. this might make copy paste easier and as long as the .h files are included as normal arduino libs then the arduino project should still compile.

vm supports more than one project in a solution and also supports a mix of arduino and other projects in the same solution

Looks like the limitation is VS2008 when in C++ mode.

When I use it for C# I can copy a file in the solution explorer using Ctrl+C / Ctrl+V.

I just created a VC++ project, added my library files and tried copying a file. Nothing happened. I guess I'll have to stick with using Windows Explorer. It seems Microsoft have forgotten about C++ development. There's a few other things I've noticed only work if you're using C#.

Iain