Custom column in Outliner

I would love it if there was a “custom” column in the “Outliner”, or if you could change any column to be “Custom” to allow you to track things you might want to track all on one page with the title, synopsis, etc.

For example if I wanted to list in the Outliner the location of each scene… if there was a “custom” column I could do this. It would be very helpful.

This has come up a lot (just search the forum for “custom columns” to see other posts on the subject). Basic (text-only) custom columns are coming in 2.0.
Best,
Keith