Hi Curly,
TG2 does not natively support rendering over LAN.
However, these forums contain some posts on people who make scripts for rendermanagement but also distributed rendering.
I'd suggest you use the search function for digging this up, since I can't come up directly with precise info.
TG2 also has an instancing function, simply called populations.
Otherwise I'd have to place those hundreds of thousands of trees myself, oh no way

TG2 also supports EXR output. In the temp folder there's also an automatic mask output.
Cheers,
Martin