I am not sure if it is a bug or something new they added... but in 1.7.3 you can hold down the right click to continuously place blocks, while in 1.8pre you have to click right click over.. and over.. and over again... my arm is killing me!
Please change it back! or make it toggle! (if anyone knows a mod to fix this let me know!)
What? why?.. I suggest changing it back... at lest for placing blocks (I understand why they did it for monsters and stuff) but it honestly makes it harder to play for longer periods of time.... maybe alt or ctrl hold + right click to continuously place blocks.