Maybe the next knoppix release? The current release, 3.9, is buggy and may or may not allow you to add/remove packages from a running system. If you really want it on a Knoppix CD then I guess that the only option you have it to make your own Knoppic CD through a process called remastering. I wrote a HOWTO document about it called HOWTO: Remaster the easy way using menu based scripts. There is the wiki document http://www.knoppix.net/wiki/Knoppix_Remastering_Howto. And even an alternative method here http://www.knoppix.net/forum/viewtopic.php?t=18222. If you intend to remaster then I would recommend that you use Knoppix 3.8.2.

I hope this helps.
James