I use rMBP with the latest Mavericks 10.9.2.

1 - I often download something in background, so I can't just press "poweroff" button, because these downloads stop working in sleep mode. However, I have checked "disable sleep mode when display is off" in energy saving settings.

How can I turn display off without putting system into sleep mode? I only found a way just to leave macbook and don't touch it, it turns off just as selected in energy saving settings.

2 - When I download any archive file and unpack it, it looks good, but if I copy it to usb stick or lan drive, windows clients see copy of each file with a dot in name. Looks like it's a mac os' system files. How can I disable it? I really don't want to have it in unpacked archives.