Thanks for your reply.
#2 Magnetism was mentioned only because I missed the explanation of its use.
#4 Alignment using SHIFT is extremely useful. Thanks. The word "current" in your reply is important. Horizontal refers to the on-screen image you see. But, if you rotate the terrain, you also change the "horizontal" plane, allowing a far more flexible editing of the terrain.
#5 I'm soooo lazy...
H