"Display category description in TOC" feature in Category_display module

I needs to display a full list of some categories (without nodes in it) with additional text, but cannot found how to do it with standart Category functional.

For example, I have some categories of firms (Financial, Medical, Science) with description.
And I have node type 'firm', that linking with category of firm.

I needs to display list of firms by category and an additional page with teasers list of all categories, linking to full category description. Menu structure must be like this:
- Categories (list of all categories in container 'firms' with teasers or description)
- - Financial (full description of category without anything)
- - Medical (full description of category without anything)
- - Science (full description of category without anything)
- Firms (list teasers of all firms without splitting by category)
- - Financial (list teasers of all firms from category)
- - Medical (list teasers of all firms from category)
- - Science (list teasers of all firms from category)

I can't do something like this with embedded functional and goes to do something with my hands.

I write an additional module with this functionality, that works only with PHPTemplate themes, but I think will be good to commit this functional in Category_display module (with enable-disable option).