Allow users to share details with companies

I would like to be able to define details that I can share with companies, especially when reporting bugs. Examples include global-level details (my OS), company-specific details (my username), and product-specific details (version of the product I'm using). These examples are software-oriented, but could apply to other companies as well.

This would obviously be opt-in as not everyone would be comfortable sharing their username, etc.

When creating a question/idea/problem/praise, I should then be able to choose from a list which details I want to add to this issue. (Having an "all by default" option would be great.)

Example: Under global I have defined a field called "OS" with a value "Windows Vista", under Widgetr Corp (the company) I've defined "username" "kwill" and under Desktop Widgetr app (the product) I've defined "version" as "0.9.2".

I report a problem for Desktop Widgetr app. Next to it all the fields and their values appear. (But if I was reporting a problem for Gadget Corp, only the "OS" field would appear.)

The company responds and asks which version of Vista I'm using, so I *update* my field to say "Windows Vista Home Premium 32". This serves me well in future issues that I track with this and other companies!

Points of trickiness:
* The fields should not update in old issues. If I reported a problem 6 months ago and I've upgraded in the meanwhile, it may not apply anymore, and this would be confusing.
* It should be easy for customers to add or or companies to request new fields when looking at a topic (e.g. Company asks, "Which browser are you using?" and adds a "browser" field, customer comes back to topic and fills it in (and chooses whether to make it global/company/product-specific))
* Maybe there should be topic-specific fields too.
* My assumption is that like everything else, this sharing is public. I am not suggesting anyone wants to or should share passwords, personal info, etc.
* Link details. If I'm providing my username for a webapp, in most cases it would probably be useful to link to my profile on that webapp.

OR, is all this already covered in part by http://www.getsatisfaction.com/getsat... - in which case I'd like to focus this suggestion on providing an easy way for me as casual user, rather than a company, to provide this information repeatedly.