I am missing a window with a list of samples that can be viewed and directly translate the samples into editable strips.
In most DAW it is so solved, it is very easy to work, it is convenient.
Feature requests go to http://tracker.ardour.org/
The right currrent solution depends on what platform you are on. On Linux, Samplecat is an excellent sample librarian that allows direct drag-n-drop into Ardour.
Also, it isn't clear if you mean samples already present in the session, or samples stored somewhere on your hard drive. For the latter, you might consider the Session > Import Existing Audio dialog, though it does not try (hard) to organize your samples (though you can tag them).