There is an great article about SCIM in the September 2011 PCLinuxOS Magazine:
Thanks, I feel honored. However, after a new install, LibreOffice started behaving differently and would not respond to the process I described in the article. To make SCIM work again, you also have to open Konsole and, as root, type
then type kwrite to fire up the editing program and open a file called Xsession, to which you will append the following lines before the line that starts with exec
export XIM_PROGRAM="scim -d"
and, after a log out/in, that does the trick.
I hope that helps!
For OpenOffice, what does the trick for me is to remove the package openoffice.org-kde4.