I guess you were wondering if you could add 'custom fields' to Versions. The answer is no, it's not really possible. Custom Fields can only be added to issues -- Nothing else has that ability.
If you were looking for custom plugin advice, you should create a new database table and store the Version ID as well as the custom field you want. Then I'd advise writing a Web Panel plugin module, to render the new 'Versions' page. You could use logic to 'create' a new version AND your custom field. Then your 'web panel' can SHOW both at the same time.
Obviously, there would be some overhead in 'replacing' the screen like this.
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