This answer completely ignores the request in favour of addressing the how you contact the right people to make a feature request in an upstream project.
This request is already been asked and rejected. The behaviour is already possible through existing mechanisms (see the comments on your question).
For the best way to get something like that under the nose of somebody who makes the decisions, you need to find out where a package comes from. Start by tracking down the package for the command:
$ dpkg -S `which chmod`
Then look at the
coreutils package details:
$ apt-cache show coreutils
Maintainer: Ubuntu Developers <email@example.com>
Original-Maintainer: Michael Stone <firstname.lastname@example.org>
Replaces: mktemp, timeout
Depends: dpkg (>= 1.15.4) | install-info
Pre-Depends: libacl1 (>= 2.2.51-8), libattr1 (>= 1:2.4.46-8), libc6 (>= 2.15), libselinux1 (>= 1.32)
Description-en_GB: GNU core utilities
This package contains the basic file, shell and text manipulation
utilities which are expected to exist on every operating system.
Specifically, this package includes: arch base64 basename cat chcon chgrp
chmod chown chroot cksum comm cp csplit cut date dd df dir dircolors
dirname du echo env expand expr factor false flock fmt fold groups head
hostid id install join link ln logname ls md5sum mkdir mkfifo mknod mktemp
mv nice nl nohup nproc od paste pathchk pinky pr printenv printf ptx pwd
readlink rm rmdir runcon sha*sum seq shred sleep sort split stat stty sum
sync tac tail tee test timeout touch tr true truncate tsort tty uname
unexpand uniq unlink users vdir wc who whoami yes
Launchpad and Debian are red herrings here. They're very downstream. The project is a GNU one. The Homepage link is a good start here: http://gnu.org/software/coreutils
On there you'll find the various mailing lists you'll need to convince people on, as well as bug trackers (but I'm not sure how they'll take a feature request - check the rules first).