To make it easier and faster when that's all you need.

We do already have shell RPM and DEB packages but we should also provide archives of the shell wherever we provide full archives, on every platform and distro, both community and enterprise, and will not include separate debugsymbols archives.

Everywhere we push a nightly or release build -
http://downloads.mongodb.org/linux/mongodb-linux-x86_64-suse12-3.2.5.tgz
http://downloads.mongodb.org/linux/mongodb-linux-x86_64-rhel70-latest.tgz
http://downloads.mongodb.org/osx/mongodb-osx-ssl-x86_64-3.0.10-rc1.tgz

Push something like -
http://downloads.mongodb.org/linux/mongodb-shell-linux-x86_64-rhel70-latest.tgz
http://downloads.mongodb.org/linux/mongodb-shell-linux-x86_64-suse12-3.2.5.tgz
http://downloads.mongodb.org/osx/mongodb-shell-osx-ssl-x86_64-3.0.10-rc1.tgz