Update: I found the 10.5.6 file again, and had to move it from within bash even after changing the permissions of the original and modified files. Other than that modifying the file was just like it was last time.
I poked around the settings for a minute and did not see the advanced gestures options like I did previously. Maybe I just had to restart. It sounds like both the hard way and the easy/better way (yours) work, so all is well. As usual, I embarked on the hard way... Thanks!