Updated script:
[landmarks_stage2_configurable_v4.py](sandbox:/mnt/data/landmarks_stage2_configurable_v4.py)

What’s added:

* `edit-config` now supports:

  * `--run-cmd-before-eval`
  * `--run-cmd-zoom`
* global default postprocess tags:

  * `analyze --default-postprocess-tag key=value`
  * `edit-config --default-postprocess-tag key=value`
* interactive group review now has a preview loop:

  * `Enter` / `e` = edit current group
  * `n` = next example
  * `p` = previous example
  * `o` = run external visualizer again on current example
  * `s` = skip group
  * `!` = stop editing
* global `defaults.postprocess` is stored in the same config file and applied to all groups during build, then group-specific postprocess overrides it

Important placeholder support for `--run-cmd-before-eval`:

* `{lat}`
* `{lon}`
* `{z}`
* `{mapset}`
* `{group_id}`
* `{group_label}`
* `{raw_type}`
* `{name}`

So your GPXSee command can be written like this:

```bash
python landmarks_stage2_configurable_v4.py edit-config ^
  --config stage2_config.json ^
  --run-cmd-before-eval ".\GPXSee.exe D:\maps-bg\gmapsupp\gmapsupp.img \"geo:{lat},{lon};z={z}\"" ^
  --run-cmd-zoom 19
```

If you want every detected group to get a visible fallback tag by default:

```bash
python landmarks_stage2_configurable_v4.py analyze export-v7-00235051.csv ^
  --config-out stage2_config.json ^
  --default-postprocess-tag tourism=attraction
```

or while editing an existing config:

```bash
python landmarks_stage2_configurable_v4.py edit-config ^
  --config stage2_config.json ^
  --default-postprocess-tag tourism=attraction ^
  --run-cmd-before-eval ".\GPXSee.exe D:\maps-bg\gmapsupp\gmapsupp.img \"geo:{lat},{lon};z={z}\""
```

Then build as usual:

```bash
python landmarks_stage2_configurable_v4.py build export-v7-00235051.csv ^
  --config stage2_config.json ^
  --osm resolved.osm ^
  --gpx resolved.gpx ^
  --resolved-csv resolved.csv
```

I also verified the non-interactive path:

* `analyze` runs successfully
* default global postprocess tags are written into the generated config

One important detail:

* the global default postprocess is now stored under:

  * `defaults.postprocess.add_tags`
  * `defaults.postprocess.remove_tags`
* build applies those to **all groups**, then applies group-local `postprocess`

That gives you exactly the pattern you asked for:

* visualize example
* inspect the symbol in GPXSee
* decide naming / icon / tags
* move to next example in the same group
* keep everything in the same config file

The next strong upgrade would be adding a dedicated `--run-cmd-before-eval-on-enter/--no-auto-open` toggle, so you can choose whether each group auto-opens the first example or only opens when you press `o`.