How to debug extensions?

How can I simulate the input to an extension? It might be helpful if there was a way to run `timew export` in a way that would create extension-input format.

I worked around this with a special extension, verbatim:

```bash
#!/bin/sh
env > /tmp/timew-dump.env.txt
cat > /tmp/timew-dump.txt
echo Dumped to '/tmp/timew-dump*'
exit 0
# Saved in ~/.timewarrior/extensions/verbatim
```

Then `timew report verbatim` will create the file `/tmp/timew-dump.txt` containing:

```
color: on
confirmation: on
debug: off
journal.size: -1
… etc
```

Is there a better way, or should this be included as a feature?
Thanks!