"- a river tool (I know it's not easy, but one can always hope...)" Does Vue have a particle system? Making a flowing river would be fairly easy and convincing with the combined help of a particle system and metaball technology like the hi-end software is capable of. Not to mention a particle system would be useful for making "weather events" like rain and snow (ideal for a landscape program). So, if they don't already have this, I think it should be something they might consider adding. Currently, I know of no other landscape program which uses particles to accomplish these otherwise difficult objectives. Would definitely give them a leg up on the pack.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.