I have to say, this is wrong. It may have once been true. I just
used the gparted distro to do this very thing - see my earlier
post.
http://gparted.sourceforge.net/documentation.php
This is a light fast download and it definitely will allow you to
resize an NTFS partition as clearly shown in their documentation
available from the above page
I'm also remembering now that one of the reasons stock partition tools
would not handle NTFS in the past was the sensitivity to MS patents /
copyright on NTFS - something that Fedora/RH avoid but some other
distros disregard. That's the same reason you don't get your Windows
file partitions mounted by default on stock Fedora/RH install and other
distros do. So I'm curious as to how gparted is now OK w/ carrying NTFS
code.
Mark