If the cache configuration is changed as recommended in the core api (https://docs.typo3.org/typo3cms/CoreApiReference/ApiOverview/CachingFramework/Configuration/Index.html#cache-configurations), it would be possible to set a different backend in LocalConfiguration.php / AddidtionalConfiguration.php. Currently the backend always defaults to the DatabaseBackend. I am not aware of any way to change the defaults. If you change the cache backend for rssdisplay in LocalConfiguration.php this will get overridden by rssdisplay/ext_localconf.php.
If the cache configuration is changed as recommended in the core api (https://docs.typo3.org/typo3cms/CoreApiReference/ApiOverview/CachingFramework/Configuration/Index.html#cache-configurations), it would be possible to set a different backend in LocalConfiguration.php / AddidtionalConfiguration.php. Currently the backend always defaults to the DatabaseBackend. I am not aware of any way to change the defaults. If you change the cache backend for rssdisplay in LocalConfiguration.php this will get overridden by rssdisplay/ext_localconf.php.
What I mean is change this:
to somthing like this:
I can create a pull request.