Not sure about adding columns to an existing editor tab, but there are a couple of alternatives...
1. In the links you provide, to add a tab containing those debugging columns,
just follow the examples about Column comments or Describe Sub partitions.
2. In the Reports View, add a new report under the User Defined Reports node to run a query returning those columns
Yes, I did think about adding as a new separate tab (and I captured the SQL from the existing screen to facilitate that) however it would be nice to have it on the first tab if possible. It's not a huge issue, it's just a tweak to make it as efficient as possible for me personally.