Hey, nice of you to drop by for some DromEding! I can answer some of your questions:
1. You can use the command speed_fac to increase camera speed, but it also increases rotation speed. You can use the command rotspeed_fac to decrease it. I like to use speed_fac 8 and rotspeed_fac 0.25 myself.
3. There is no auto fit like in Hammer or Radiant. There is, however, a new texture mode with NewDark; AlignExt. You can activate it by selecting a face and clicking on AlignNorm then AlignBr. You can then resize a texture to your heart's content until it fits the face. You can also flip it by entering a negative value.
4. No, brushes have to be resized from the middle. It's a bit cumbersome and takes some time to get used to. I rarely resize by hand now, I enter dimensions directly instead.