Hello!
I am having a problem with block destroyability. In your wiki it says "By default, ToolProgression enforces that not harvestable blocks are unbreakable" which is exactly what I want. But while I seem to be able to change the level of pickaxe or axe a block requires, I am still able to break planks, logs, and stone blocks with a piece of string in my hand. Some drop themselves, some drop nothing, but all break. Script lines I am using include:
S:"minecraft:planks:*"=axe=1
S:"minecraft:stone:0"=pickaxe=1
which seem the same as a post about making wood planks non-harvestable with bare hands that I found in an older issue, but it doesnt' seem to work that way for me. Are there any mod interactions or other problems I should be looking into or advice you can give?

The new version 1.6.3 adds this feature again. I also updated the documentation. Feel free to reopen, if the issue persists.