Can you make it so you can recycle blocks back into betterlogs; and also be able to saw betterlogs into planks (4 each, since a full log makes 16) and chop them into firewood (4 for 3 firewood, to match the default recipe)

It's cool that you're working on it.

I was able to replace the tree logs in treegen with the round logs, but then the trees wouldn't fall like normal trees when cut down, it treated them as placed logs and you had to cut the logs one at a time, so I have some more digging around to work that out.

It's good to have that option. I would love an optional mod where trees spawned with these logs too, though. I'd definitely use it. Great mod. I often chiselled my logs to be more round in builds, but then I need to multiblock chisel to put bark back, and it never looks right.

That is correct, vanilla trees are still vanilla so you can still have the vanilla logs along with the better logs if you wish.

If I understand this correctly, this doesn't change trees right? And logs you get from trees will be vanilla until altering them into Better Logs?