I don't use GUI tools, but doesn't SWAT come with the Samba package? Its probably already installed, but I could be wrong. I think that SWAT runs from xinetd, so check your /etc/xinetd.d directory for a swat file. If you find one, edit it with a text editor and change the "disable = yes" line to "disable = no" and restart the xinetd daemon --> "/sbin/service xinetd restart".
ChrisP