I have just tried this code for the first time (in fact it was the code for #2427 I tried, which incorporates these changes), and compared with 3.8.2, using default empty ini files to ensure all defaults were used:

/usr/local/bin/Jamulus -s -i /tmp/x.ini
./Jamulus -s -p 22125 -i /tmp/y.ini

The 3.8.2 defaulted to "Not registered", with the "make my server public" checkbox unticked, which is good.

The newer version defaulted to registering with Any Genre 1, which I think is not good. The directory drop-down should default to "None", if not set in the command line or ini file, so that a new server does not register with a directory until the user asks it to.

Originally posted by @softins in #2199 (comment)