Customer/Company field

If possible, I'd like a field where you can create/select customers for the specific issue.

Not like the select-fields where you must be the administrator to create values for the selectbox.

Maybe a multiline-box for the values, where the first line is the companyname, and the rest of the lines are contactinformation.

And while selecting the company, it should be either a dropdown/select-field or an ajax-like textbox (like the user-fields)

That's one of the things we're missing in this system. We can manage without it, but it would be great to be able to link our issues to customers in an easy way.