I don't think that all of these issues can go unaddressed. #1 is obviously a problem that I'll bring up tomorrow (re: spectators who did not contribute getting an achievement). #3 we are addressing. Could you elaborate on #5?
The rest are subjective, and of course I wouldn't be one to tell you that you can't password the server you pay for. But, I still think there could be a bit of understanding for newer players. They don't know they're ruining anyone's game; they're trying to learn. We were all level 0 once. They could be people that, down the line, join your team as valuable players. The more we help them understand the mechanics the more likely they are to stick around. More people to play with is a good thing
First it's awesome to be able to tallk to the staff directly. This is awesome.
Now to the point.
Those are my personal reasons and in any way I am not certain that I am absolutely right. Just trying to help by stating my experience so far.
the #5 that is the slow vote kick goes basically like that: You initiate a vote kick during the trader time and the person usually gets kicked after the next wave have started. Resulting in spawning more zeds for the people who are left in the game. The actual kick must hapen right before the next wave starts like it was in the "Noob Filter Mutator" for KF1
About the new players I am absolutely 100% sure that there is not a sinle KF veteran player who doesn't enjoy teaching new players how to play. But if a new player joins a server called for example "Veterans server KF1 1000 hours+ teamplay or GTFO lvl 15 to 25 HoE acheavement hunting FTW" then something must crack in their brains that this server is probably not a good place to learn.
The main problem is that finishing one map on HoE takes forever, sometimes over an hour - that is too much time to risk for some random person to join and ruin it.
When the game is finished and all the perks are in this time will be shorter and then when someone ruins it won't be such a big deal. For me a map should be finished for about 30 - 40 minutes on the hardest dificulty possible.
Also you can add some nice filter so that we can have more servers like a Hard server that only player up untill lvl 15 can join so that there is noone that takes all the kills for everyone and a HoE server that only lvl 25 can join so that there are no noobs ruining the game for other people and so on and so on - the possibilities are endless.
The people who level up on perk leveling maps wold be really hard to battle, and to be honest are the reason I stopped playing KF1. The W/L ratio on my server was down to below 0 a few months after you removed the whitelisting.