Hey, did you ever get this solved?

I have the same problem with pasting where I didn't intend.

I found that I can run xmodmap -e "pointer 1 9 3 4 5" and the wheel button no longer functions (ya!).

I haven't figured out how to make this configuration active at boot time. Probono wrote in another post that you can put things in your knoppix.sh. I don't have that file anywhere on my HD install. I created a knoppix.sh file in my home directory with the xmodmap command in it but that didn't work. I also tried putting the argument in a .xmodmaprc file in my home directory and in the root directory. No good. Any ideas?