With a big dank that has a lot of different blocks it becomes harder to find the specific block you are looking for, so if you could look at a block and press the key bind for pick block you would select the block you are looking at from your dank if you have that block type in there.

Could you make it so when you use pick block when not holding the dank it will switch to holding it?
I'd be willing to make a pull request if you'd like.

fixed pickblock not working with mouse in 3.7