You can define a water area under the "regions" tab. Should be able to add a new region, set its type as Water, and then define a center point x,y,z and the "extents" in x,y,z which defines a 3D rectangle which the game will treat as water.
Object models (trees etc) would go under the "models" tab -- you'd need to add a "definition" (the model itself) and then "placements" that use that definition to define where they appear in the zone. I can't remember if the tool is set up to import object models from .obj, though... Could at least try it with object models from other .eqg-based zones though by extracting their .mod and texture files using
EQGExport or S3DSpy. But that's probably a bit too complicated in itself...
If there were legitimate interest I might consider improving these tools, but there isn't.
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