Please add a dialog box to display the primary keys that are selected on a table. This is just an issue of convenience. Currently, they way to add a field to the primary key is to scroll to the field in the table, then right click and select 'Include in Primary Key'. This becomes unwieldy when you table has 100+ fields in it.
Now to figure out what fields are included in the primary key, there is constant scrolling up and down to see the key icon on the field(s).
A single button or short cut menu to 'Display fields in Primary Key' would really be convenient.