The mailing list for Octave development discussion and sending contributions is maintainers@octave.org. 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 project is inherently more conservative and follows narrower rules.