I've found a sort of temporary fix for floating forests. It adds an extra step.
1. Open your map for the first time in WRPedit (not the wrptool)
2. Place the types of forests you want in the map (just one section will do) make sure you fit to ground.
3. Save
4. Open in WRP tool
5. Copy and past till your heart is content.
6. That simple ....
Temporary Forest Fix
Moderators: Lone Wolf, Snake Man