I hope you like my ton of ideas. It is up to you if you wanna add them or if its even possible to make. I wanted to help you with ideas to make the mod more popular because there aren`t much videos on Youtube.

Trees thicker than 1 block, doesnt seem to rot away (like picture above). If they do rot away it takes hundreds of hours, so you have a dead forest with only dead trees that dont rot away and the new trees need that space to regrow. They need to rot faster if they do. Podsol and mushroom generation seems also pretty slow. I didn`t have any podsol in my playtime (like in picture above) but in earlier versions i had a little.

Oh and a question: How to get applepips in survival?

Suggestion: Really old trees could have lots of vines podsol ferns and mushrooms and maybe turn cobble to mossy cobble and maybe get some mossy roots and stem and branches texture and when there is a cave under the tree his roots should grow into the cave and if there is lots of dirt near the tree he will grow faster and bigger cause more dirt=more nutrients but when he has not much dirt he will stay small this would make a realistic forest and you should add special lamps so you can grow trees in caves or closed rooms and maybe make trees a bit more round like picture below cause trees in this mod look a bit flat when you look from above.

Thanks for this great mod i wished a mod like this since i know minecraft ! :D