You could probably hack something with [the `-c` option](https://www.geany.org/manual/current/index.html#command-line-options) to Geany.
Something like this not well tested shell script comes to mind:
```bash #!/bin/sh set -e temp_dir=$(mktemp -d -t geany-config-XXXXXXXX) || exit 1 trap "rm -rf ${temp_dir}" EXIT cp -r "${HOME}"/.config/geany/* "${temp_dir}" geany -i -c "${temp_dir}" ```
Save it as an executable script somewhere and then run that when you want to hack on the super secret stuff. You could also just write a simple wrapper script that opens Geany normally and after it closes, use `sed` or whatever to delete the `recent_files` or whichever entries from `geany.conf`.
Just a couple workarounds.