Do you have a Manager or Pro? If you are using the ShopSite Pro software, then you do have the ability to do a power edit for your pages and products.
For the fields you mentioned specifically, you would go to Products > select your products > Power Edit, and the setting you are looking for would be in the Layout box. Click Global and then proceed.
The help documentation for the Power Edit feature can be found here:
http://www.shopsite.com/help/current/en ... ducts.html
If you have Manager, then you should be able to change this for all of your products if you use the Database Upload/Download feature. More information for Database Upload/Download feature can be found at the URLs below:
http://www.shopsite.com/help/current/en ... .show.html
http://www.shopsite.com/tutorial/utilities-database.htm