lockups by progression
If you want to make really nice way of going into the ns game, you could introduce lockups on different abilities and guns and lifeforms. I got the idea (which probably has been suggested many times before) about concede-function first because these days many different skill levels play on the same server and finishing the game is important for the rookies but less so for the vets (who knows when the game is over usually) since they really has to see how EVERYTHING works game mechanic wise. A rookie can learn a lot from the endgame. How to handle weapons, how different lifeforms works and so on. So if you make concede button only work till you get a certain level (hivetime, skill, whatever) you can have this function only to work for higher skill levels. This thinking could also be applied higher lifeforms or guns. The point is that to a rookie gets overwhelmed by all options and this will make it easier for him/her and create a sense of progression. Also, as a bonus, smurfs will get really annoyed! And for the business minded that complains about lockups, you could maybe get a all lockups for a (tiny) fee.