Taxonomy hierarchical tags module

There is the idea of developing a module for implementing a hierarchical taxonomy and combining functions of custom tags.
In this case, it is assumed that the module should not break the normal operation of the mechanism of taxonomy and tagging.

The logic of this module is this: When you create a dictionary flag is set on "tags" and additionally generated module flag "hierarchical". When creating a node controlled by this dictionary, the standard autocomplete field for the tag is replaced by a field with enhanced functionality.
Input format tags in the field is supposed to look like this:
Electronics - Cell Phones - Apple - iPhone - 4G
Electronics - Computers - Laptops - Apple - MacBook Pro - 17 ".
Where the levels of the hierarchy separated by '-'.
Of course, the tags can be entered separated by a comma ",".
In this case, the block between commas - "tag" is perceived as a separate term.
Each term is entered in the dictionary with the indicated hierarchy. By the end node is bound term.
Thus, in the examples above, tags are added to the dictionary - 4G and 17.
That's where the fun begins:
1. In the derivation of the node, the terms are specified with full path.
2. Upon subsequent entering the same or similar terms AutoComplete offers them these terms as options in the field making the same, taking into account the full path.
3. The term Apple in both cases is the same term.
4. Any expansion associated with the mapping of all nodes, linked to the term and its children when viewing the term will work. When you view the term we will see Apple both nodes.
In general, this approach will significantly expand the functionality of the taxonomy and to build a hierarchy with no pre-defined structure (without unnecessary duplication).
In general, solutions to all of my description of the functions worked. But before writing such a module, I would like to clarify the public interest in it, to discuss possible pitfalls and to find interested people willing to take part in development.