Why not simply add it to your local repository instead? http://maven.apache.org/guides/mini/guide-3rd-party-jars-local.html

Yes that is a possibility, I actually did that, but I often develop on different machines and this means to install it like this on every machine (which is not hard, but as I said, user interaction optimization is a very good idea while developing anything).

If you want something to be as easy to use as possible, why not have it in the central repository for everyone, so future developers doesn't have to do this step anymore.