Okular allows to customise annotation settings ("Configure Annotations"), but there seems to be no easy way to share these to another installation. Typically, one would like to keep their annotation style consistent across multiple devices and doing this manually requires some work (especially fine-tuning the colors). It could be nice to have a feature to import and export annotation settings from Okular. As a partial replacement for this feature, the Okular manual could include information about where these settings are stored.