Is there any GUI tool to configure /etc/fstab?

Now Gnome comes with a very powerful tool for this, Disks. (Formerly known as Palimpsest; it looks like phogg's prediction was accurate).

How about pysdm

Clicking the gear icon for a particular partition in disks provides a menu option called 'Edit Mount Options'. Here in, set the Automatic Mount Options to 'OFF'. Thereafter proceed to define your custom mount point (for that you may wish to create your directory e.g. sudo mkdir /mnt/windows)

The comments=gvfs-show is key (don't forget to the comment= else it won't work in Ubuntu 14.04)

Changing the filesystem type from auto to the correct type (ntfs, ext4, xfs etc.) is also recommended.