Unfortunately nobody is going to be in the slightest concern (of losing a user) if you go to download Ubuntu and start using it. On the hand if you eventually find it more useful and stick to it, we will be happy for you. The thing is Knoppix user based are too few and the developer is not even frequenting this forum, so this is what you would expect. If you really need attention, I suggest you post it to debian-knoppix maillist.

Technically I haven't noticed the sound would come out from the wrong port. But I do notice some versions of kernel (alsa drivers) do have problem with speaker jack. With internal speakers it is working but when the speaker jack is plugged, it is mute. But I think those are history. If you use a kernel recent enough, I believe it will not have this problem.