I prefer leaving all the file management stuff to the OS, so I can keep the wanted logical positioning and shell operations according to my OS preferences.
For all people who would like to only import file 'information' into PB and use it as information manager rather than file manager (much beyond PB target, I think), it would be fine to have a file import capability, for all files which can be opened inside PB notes. So I would leave all .doc, .txt, .rtf, .html, .xml...... files in their source folders, so that I can still edit them with other specific SW. After importing them into PB (one by one or by importing their parent folder), I would like to have their txt, rtf, or html content readable inside PB notes. So I could organize physically files in the OS and logically in the PB, edit them with (or link them within) specific apps, quickly navigate them in the PB plex and read their related info in the notes panel. This would mean an updating of file content in the notes panel, which could be executed at thought selection or by manual request (update button). This would also leave the user the freedom to build up a network of files (for example a portion of a web site) and to use PB as a browser, with the bonus that external items can be mixed and linked with internal PB thoughts. All external file structure could be linked into PB with relative addresses, so that I could have a 'portable' brain file that, if relocated on other media together with external files, would still be capable of finding any information...
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I'm Wiston Wolf, I solve problems.