In the manual it says that the shutter release needs to be half down for the IS to be on. How would you do that with the remote shutter cable? I know the IS switch has to be in the on position on the lens but I wasn't sure if the remote shutter cable would activate the shutter in a way that it would enable IS. I guess auto focus would be in the same category for functionalty although I won't be using that. I just want to make sure the "IS" works before I buy it.