This is indeed planned for the next major update of Norrkross Movie.
That version is still a few months away though. Until then, you can
view the System log (/Applications/Utilities/Console.app) in which the
application complains about missing files. Also, the file format of
Norrkross Movie document is somewhat human readable so you can open
the files in an text editor to view and change file paths. Both of
these workarounds are of course quite geeky.
If you put media files in a folder called "Media" in the same folder
as the movie project file, -Norrkross Movie will search it for files
that it can't find in their original places.
Thanks for your patience,