Since a new terrain engine is in development. Perhaps an idea I mentioned a few months ago would be beneficial.
Instead of making all the trees destructible. Why not make certain areas of trees destructible? Since the trees we have now are 'coaded' as indestructible (part of the ground terrain), why not make a few tree models that are made to be destroyed? These would be in populated-only areas. Not in the boonies were even b29s wouldn't have a need to be at.
3k around GV spawns and on the way to towns/around towns and bases (up to 4k around bases and 2k around towns including inside the town).
If you think it is possible to do this, then do it. If not, I think most of us understand why.
As an example.
Red dot is my wirble.
Area in the blue lines is the 'spawn point' all the trees in this area would be destructible, all trees outside of this area, wouldn't be.
All trees in the green area would be destructible also and again, only in the green/blue areas. So the trees on the mountains in the background.. would be the titanium trees.
Would it be possible to copy the tree (or make a few models of trees) and make them destructible? Then put em everywhere near spawns and bases/towns (perhaps some ON the bases (if they had them, because I don't know) ), if it's possible.