It depends on what method you’re choosing to modify the menu as I described previously: 1 or 2?
For method 1, if all you do is modify the still menu background, you can correct the spelling errors by modifying the menu text in a photo editor. The button hotspots and links will still be there when you import it back.
For method 2, if you’re recreating a whole menu page with menu texts in different locations, you will need to recreate the button hotspots/rectangles enveloping the button highlights in Vegas. The links you can link to anywhere as you fix this when you import it back in DvdReMake. And yes, you can add in audio background. You will need to enable the audio in Audio Tracks pane.
Guide: Enabling Audio From Imported DVD Menu
The List of Useful Topics will give you more info, look in the last post.