Since the Mod is pretty demanding I think it would be a nice thing to have a better config option to allow deciding a rough amount of tree density.

So you could say set it so less tress generate or for crazy people more. Since every changing block or updating tree in a chunk that is loaded will need chunk re:rendering and data management this could improve playability by a ton for lower end machines/heavy modpacks/servers.

Depending on how the config will be set uo you could make it so a general tree spawn rate divider/multiplier is used or even a biome type specific one (could also lead to some really funny customizability like super tree mountains XD).

But even the simply divider/multipler would already be a life safer.

PS: The Dynamic trees are one of the best things that happened to modded minecraft in terms of improving world visuals. Gj on that Mod.

GZ
SirAron

This is implemented with the dynamic trees worldgen.json file. It's has the power to do everything you mentioned and more. However it's poorly documented at the moment.
Here are examples:
https://github.com/ferreusveritas/DynamicTrees/blob/1.12.2/src/main/resources/assets/dynamictrees/worldgen/default.json
https://github.com/the-realest-stu/DynamicTrees-BOP/blob/master/src/main/resources/assets/dynamictreesbop/worldgen/default.json