Version:            (using KDE KDE 3.3.1)
Installed from:    Gentoo Packages
OS:                Linux

KDevelop really lags virtual project logic. Perfect would be the organization logic of MSVC7x, meaning:
-Solution1
--Project1
---Base
----Base.h -> ./Sdk/Include/Base.h
----BaseInternal.h -> ./Main/Include/BaseInternal.h
---Main
----Main.cpp -> ./Main/Source/Main.cpp
--Project2
---Main
----Main.cpp -> ./Plugin1/Main.cpp
---System2
----System2.h -> ./Plugin1/System2.h
----System2.cpp -> ./Plugin1/System2.cpp
----SystemTypes.h -> ./Plugin1/SystemTypes.h

I know, its a lot of work to implement such a feature, but it IS handy. The grouping feature lags sub-groups and regexpr... But it would be hell to build up such "logic" with regexpr, wouldn't it be?