a.)
Yes, just add blacklist=ssb,b43,bcma like so:
APPEND initrd=/tce/boot/core.gz quiet waitusb=5:UUID="..." tce=UUID="..." kmap=qwertz/de-latin1 tz=CET host=b590 blacklist=ssb,b43,bcma
b.)
cat /etc/sysconfig/Xserver
I think Xorg provides better functionality for keyboards than Xvesa. So you might want to give it a try.
Otherwise, it might just depend on the software you're using - Aterm can't display unicode characters, Firefox can.