The mailing list for Octave development discussion is email@example.com. Patches should be submitted to Octave’s patch tracker. This concerns the development of Octave core, i.e., code that goes to Octave directly. You may consider developing and publishing a package instead; a great place for this is the allied Octave-Forge project (http://octave.sourceforge.net). Note that the Octave core project is inherently more conservative and follows narrower rules.