You can't do it directly without human intervention in all cases .. ie: what if you'd like to convert a pure lib package like libSDL into a pnd from an ipk? its just not going to work (yet with current pnd abilities anyway.)
Most apps spew files all around the filesystem, but those could work if (say) the pnd ran from another aufs layer perhaps, or players a bunch of LD_LIBRARY_PATH tricks, or the like. Can be done, but its goofy.
jeff