Yes. But, you need to click on that button that says mount r/w before you do the edit. If you do that and it still doesn't work, something isn't right with your root.
Are you permanently rooted or are you using weak sauce for root? If the latter, the changes won't stick if you do a normal reboot. Rebooting is necessary for the setting to take effect. With weak sauce, you have to do a hot reboot for things to stick. Things will only stick if you do a hot reboot. A normal reboot will result in your change or changes reverting back to the original meaning you'll have to do it over again. It'll work as long as you only hot reboot. If you're using weak sauce for root, you really should consider getting permanently rooted.