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Would be great to have a feature that remembers a set of styles (arrows coming from boxes for example with colors) that I can pick and reuse.
Even though it is not exactly what you are requesting... have you tried the "Object > Save objects to file" and "Load objects from file" options from the editor menu bar? All elements drawn onto the current screenshot will be exported to a file and can be imported again when editing another screenshot.
Might be a handy workaround for now.