Future suggestion

[ohrenkino]

@diddi

Now if MP3Tag could manipulate the Path of the file in the "Filename to Tag" window, it would maybe make a useful feature for the future.

You are looking at the wrong function. To manipulate the path you have to use Convert>Tag-Filename as this is a writing function.
See the FAQs on how to create a folder structure from tag data:

Converters to rename files or to import tags

How to rename files based on tags? Renaming files, creating folders and complete directory structures from tags can be done by using the [:mt_ttf:] Converter > Tag - Filename with a format string. A format string is used to describe the structure of the desired filename. Besides using normal placeholders (such as %artist%, %title%, ...) and arbitrary text (e.g., Music) it also allows for separating folders with the backslash \ character. Here is an example that renames the file based on the t…