Invoice/Expense Report Custom Fields
A multi-line text field type would be nice so we can enter an address again on Invoices.
Since fields are half-width, the ability to specify left/right would give us the ability to have a little control over placement. A better way to order fields than "delete them all and add them in the correct order" would be nice too.
A "label-only" field type could let us add a bold label alone to the custom fields area.