Please describe the feature you'd like to see added.
... just like minrelaytxfee and others. Ideally, bitcoin.conf should encompass all configuration options.
Is your feature related to a problem, if so please describe it.
As a user, I would like to specify value of the incrementalrelayfee configuration option in bitcoin.conf file so that I don't have to type it in a command line each time I start bitcoind.
In Bitcoin 28.1, the option is hidden, i.e. there isn't any description of the option shown in --help.
Describe the solution you'd like
No response
Describe any alternatives you've considered
No response
Please leave any additional context
No response