we´re 8 guys who are gonna play some qw this weekend, I noticed nquake doesnt have the "midair" command.

What usefull console commands do I need to know if we´re gonna play some games?

"changelevel"
"restart"
"dmm3"

I really cant be hassled downloading KTX or something similar

I think you need to download KTX as midair is not in the original QW nor in the frogbot mod (used by nQuake when you play bots).

Also i think the midair command is actually mid_air, might be wrong though.

Have you tried nquakesv? (The server package)

No, I have´t

I was just wondering if there´s any more commands I need to now about except the ones I mentioned

hum.

if u download and install nquakesv you'll have a server like the online servers you play.
you just have to download the maps and place them under qw/maps
it's really easy, and its the best way to play on a lan.