Feature:

I think new wood variants called rotted logs/plank etc would be a very cool addition to the mod, it would work the same way as cobble and stone becoming mossy when submerged in water and would grow on wood the longer it's placed down and becomes weathered by either being submerged or consistently rained on

Alternatives:

I don't think it should be craftable but rather should only be obtainable by (as stated above) being submerged in water or left out in rain and will change randomly much like copper and the iron plates this mod adds, trees also falling when rotted past a certain point would be a cool feature but just an idea

Additional info:
I genuinely think this is a very good idea and in my opinion is the only thing more this mod needs, I found myself looking for mods that could do this for wood but haven't come across any as initially i was shocked that immersive weathering didn't already support this. Thanks for listening to my suggestion and would be very grateful if it could be thought about for a future update. also please keep 1.19.2 updated if you decide to give this a try as I really want this for my world hahah

Im not one of the developers, but this is a really cool idea honestly.

rotting wood was considered and prototyped ages ago but it never ended up working very well in practice, we likely won't add it in the future