Designing an exciter

Ok, I present to you: my first attempt at PCB design.
It’s very packed. I considered a few times to switch to SMD or to split it to two boards, but I managed to cram it all somehow. Now I imagine that the tracing is going to be a nightmare.
So, if you see something that can be done better please do tell.
Plus I have a few related questions:

  1. Is there a way to add the component values to the silkscreen or do I do it manually?
  2. I think I’ve done the ground layers (pour?), is there a way to make sure it’s done right?
  3. @AriaSalvatrice, you’ve previously suggested to change the default trace width. Can you tell me where in Kicad (8) is this setting?

Thanks, as always