You can turn off the ability to remote control Gajim. The setting you want to change is remote_control.
You can turn off the ability to use notification daemon (if there) notification popups. The setting you want to change is use_notif_daemon.
DBUS & KDE
KDE 3.4.3 doesn't appear to start a Dbus instance for the user by default. Adding the .bashrc lines from above to a ~/.kde/env/dbus.sh seems to the trick. This is under Gentoo, with /etc/init.d/dbus running.