Up until VW 2014, Force Select used to work with a keyboard shortcut. The way I would use it was like so:
Layer Options set to anything other than Show/Snap/Modify Others
Class Options set to anything
Click on object on another layer.
Type Force Select keyboard shortcut.
Now, it works the same, except I HAVE to right-click in order to do it (if I've set up a keyboard shortcut). for whatever reason, it actually makes it more difficult for me. Maybe it's lack of finger strength. I don't know, but it doesn't make sense as to why it doesn't work the way it used to, and the service select tech support guy couldn't explain it either.
It would be great if it worked without having to option click, but just regular click (the same way you can click before pasting an object in order to place it close to where you want it to be).