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AFAIK there are no preferences that can be saved for the ringbuffer options. If you'd like the default values to be changed (I agree the current ones are not useful and merely function as an example) you would need to file an enhancement request on Bugzilla. You can add the request to have the last values saved in the preferences (which makes sense as most people will have a workflow they will repeatedly use).

For now, an option could be to create a script that uses dumpcap with your settings that you can start when you want to capture. It would have to contain something like:

dumpcap -i <interface> -b filesize:100000 -b files:10 -w <filename.pcapng>

Hope this helps!