I completely agree with you that an interface on Wordpress would be much easier to a business owner than editing directly the text file

Having said that I also believe that a txt file is way more easier than schema for the rest of people who can edit a file. That txt file is done in minutes, the schema file is done in hours :P

What i feel necessary are 2 things:

- Having a separate file

- Doing something that the big websites support so we can "sell" to local businesses.

So if more people believe we should extend schema instead of going with txt, we can work on it.