AFK illegally?

If you hold down leftclick and then rightclick (while still holding leftclick), and press F11 the game thinks that you are still holding those buttons until you actually press right or leftclick again. If you do that while you have a dirt block in your hand, if you are in a place where you are allowed to place blocks (example:build battle) I assume it will keep you AFK. Until this is fixed I will use this to my benifit. Please fix this. --yhda