I can see both sides of the coin in the situation and they are reasonable.
If you are interested in this feature for this plugin and the plugin otherwise meets your needs, I would say re-write the section of the plugin which handles this evaluation and add in the allowance for an optional argument (boolean in this case should be fine) that acts as a flag to either omit or overwrite and propose it to the plugin author (assuming they are actively maintaining it). While temporarily maintaining your own, customized version