Can we separate difficulty and block interval?

[DoHaiSon]

Hi, glad to see ur repo.
Now I'm building a smart grid in theory and I saw ur project can help me benchmark our parameters before deploy.

But after few time, I saw something should be separated that is difficulty and blocktime interval.
As I understood, in yellow paper and Geth source, Difficulty is flexible param which changed block by block to ensure block interval inside 10-15s. This time helps 95% of nodes reach a new mined block.

But in ur code, I saw blocktime and difficulty is merged to Binterval. That oke in simulation but I wanna "fixed" Difficulty of a private network so I need a individual value.

Now I could change Binterval and found out good value for ur setup but rather hard to make a decision that good or not because a lot of propability change anytime I restart BlockSim.

Thx, for reading!