[X-Istence]

You can use Ctrl + Shift + Eject to lock your screen, also if you open up Keychain Access, then in options (Apple + ,) select "Show keychain status in menu bar", now you have a lock that shows up next to the rest of the menu bar icons, clicking on it provides an option named "Lock screen".

[_b8r0]

It's annoying that I have to do some sort of three finger claw salute. This is just me being lazy but is there any way to reconfigure the shortcut?

[X-Istence]

I don't know. I've never had an issue with running three fingers up one side of my keyboard!