I'm required to enforce a theme for all surveys. And so this might be easy in storing the theme name while saving the survey. I want to handle it in a more flexible way.
As the theme may vary or be renamed I want a plugin config to get the theme name and ideally directly from database.

Is it possible to get a drop down of all theme names (+ blank) in the plugin config?

_{BTW: why does LS store the theme name in the survey record instead of an ID referencing the theme, so a theme rename is done only in the theme record.}

You can force it in a plugin : www.limesurvey.org/manual/AfterFindSurvey

To get the «available» theme : inspiration : gitlab.com/SondagesPro/managament/respon...stAndManage.php#L479