In other words, this site is pretty safe...
I found out that the best way to do this is by replacing the OSX ntfs mount script with a custom command. Again, this is not for novice users, it could seriously damage your OSX installation.
Let me explain.
First we need to rename the original mount_ntfs tool.
From terminal type:
sudo mv /sbin/mount_ntfs /sbin/mount_ntfs.orig
Then create a script like this one and save it to /sbin/mount_ntfs (not orig):
/sbin/mount_ntfs.orig -o rw "$@“
We also need to fix the permissions:
sudo chown root:wheel /sbin/mount_ntfs
sudo chmod 755 /sbin/mount_ntfs
Thats it. Your volume should mount read write.
If you want to undo the change, you can also type from terminal:
sudo mv /sbin/mount_ntfs.orig /sbin/mount_ntfs
which will put back the original mount_ntfs tool.