I made a Random Block Placer with Autohotkey. There is no need for any MODS. It is a stand alone script that is customisable to place any block you have in your hotbar.
Each right click will choose a random block and place it for you. The more you choose the more random it gets. If you want to give it a go link is below. I have also put a link to the video so you can have a look also.