Yea, I don't like the bios too much. I did get a good deal on this board, but if I had to do it again, I would have gotten an Asus board. I've worked with them in the past, and it's a lot easier to deal with.
I mainly use my focusrite scarlet 2i2 for audio, but I do sometimes use the mic input on the motherboard. It can be finnicky sometimes but no huge problems so far.
I already had the wireless network adapter from a previous build.
All cores on 4.7
Most likely so.
I got the cablemod extension kit off amazon for about 30 bucks
Idle about 30c. While under 100% rendering video, it tops out at around 70c