Changing the comments input fields

The WP comments fields consists of :
– name
– email
– website
– comment

I like to change it to :
– name
– email
– company
– comments

Some problems i cannot resolve

• how to make all 4 fields required (in the wp admin < settings < discussions I can make name and email required)
• how to show the comments so that the name and the company are visible (eg “John Doe, HisCompany” said: …”).

What I would like to achieve (so perhaps there is a better solution) :

• Comments only by corporate users (using their professional email adress). In order to do so, I use the Plugin “Comment E-mail Verification”
• rating system : users can rate a service described in the post. I used to use the plugin “Customer Reviews”. Althoug very nice, there is no solution to verify the E-Mail (so in fact everyone can write reviews using someone else name/email…

Hope you can help me,

Kind regards

http://ww.wp.xz.cn/extend/plugins/comments/