Whenever I need to adjust settings I just load up a map from the console, hopefully the next build will have a better menu. You played on a bad server or a bad map, I encourage you to play on a large map with around 20 players. The weapon system for humans annoys me too, its like Counter-Strike, which is why you bind keys to purchase items. Learning to wallwalk takes some time. Turrets are very slow, as a dretch you can hit one from the side, and then run in circles around it touching it until it gets fully damaged and explodes. The worst part of the game is when there's bad builders, or deconners. Its common sense to not build turrets that block humans into an area where they won't be able to retreat when stamina is gone.
It takes some time to get good at it.