Hi!
Yes I agree with theexpert, 3DGS "is becoming" a good engine, but some characteristics like for create terrain they should be to the base of all!
in fact many engines also more recent than 3dgs they have an excellent terrain editor. And not only...
For what you say to using the shader I have already told in an other thread that 3 texture is much few! for me. And if you can make a tutorial for that what
you say would be very usefull!

Greet.
salva