Eva's Random Placement

Allows you to place blocks selected randomly from your hotbar, with significant customization as to the relative weight for each slot.

Relative selection weight can be set per slot, and should you have a different hotbar size for any reason, if that change is implemented properly, this will take that into account.
The key to turn it on can be set to toggle or hold. Empty slots will not be taken into account.

Thumbnail created by recording a RePlacer build in tandem with this mod. This is configured in a way that gives it inherent compatibility with RePlacer.