Ideally we should add the feature in a release of the software, but until then you can always rig up your own - it would be a bit of work, however.
The first thing you'd need is a table to store the data - pretty simple - just make sure you have a column which is a foreign key with delete cascade to CN_Main.ProspectID.
Next you'll need a classes to hold the data, and some code to populate those classes upon read, and to write to table on save - so you'l add event handlers on the contact business logic class ReadEnd and SaveEnding events.
Then you need to add a tab to the form and display the data, as well as handle user input.
I've added improvement
DEV-6355 to our backlog to include this.
If you can't wait, we could probably provide something via plugin - but we'd need to bill for that time - roughly 6 hours effort I think - depending on the details.
Mike