I am using Dynamic trees however wish to use them purely for world gen, I would like all other trees to be vanilla without the hassle of having to manually craft each sapling.

Is there any possibility of adding a config that allows me to disable the drops of acorns/seeds completely when destroying a tree.
Alongside this I think adding a config option to increase the drop rate of saplings would be ideal if this was possible.

You can now modify the universal seed drop rate by setting the new leavesSeedDropRate option. It can be set to 0.0 to disable seeds dropping altogether. The option is in the server config which is located at the following directories:

Singleplayer: saves/[world]/serverconfig/dynamictrees-server.toml
Dedicated Server: [world]/serverconfig/dynamictrees-server.toml relative to the server folder