Good point about the grep options, created a pull request to Geany here:

This issue shows that the whole plugin architecture have its limitations. How could Geany's FIF know about PO's external directories?

It cannot, it's something I introduced just in my plugin. Geany in general can search in just a single directory (like most other editors and I think it should stay this way). You can however pre-fill the external directory to the FIF dialog by right-clicking it in the sidebar and selecting "Find in Files...".

Maybe PO should have a "symlink external directory" button. (Except on Windows, as mklink won't to that for you easily.)

I'd leave the symlink creation up to users - as you say, it works on just some platforms and I don't think it's something the plugin itself should do.

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