A Custom field that displays a list of the names or codes of Customers, Suppliers, Employees, and Expense Claim Payers would be beneficial. You can always use the List View Custom field, but the list must be updated manually anytime there is a new customer, supplier or employee. A custom field that displays a list of contacts and automatically updates them with the addition of new contacts would be helpful. Looks like I have seen a request like this on the forum in the past but I just cannot find that topic or comment.
A custom field for “Projects” where customer name is selected (customer who owns project).
A field where Sales Agent’s name (Employee) is selected to help to track sales commission due.