Quote from MrModder
I have not downloaded it yet, but I guess I will, but could you make an option to edit normal generated
It already does that. Just go in your map, load all the chunks that you want imported into world painter, then click import existing minecraft map while inside world painter, and edit like you please. It will only load chunks you have loaded while inside the word.
Next time you ask for something, explore a little before doing so. I found this option within the first 5 minutes I used the program, and I barely ever read instruction manuals or anything.