I think there should be more random rounds and random rounds more frequently. This would make the game much more enjoyable and not as repetitive. I am not sure what kind of random rounds would be added but you can reply with some suggestions. By the way I am not saying I do not enjoy flood any more as this is my favourite game-mode/ thing to do on Garry's mod.
We have multiple Events currently such as zombie, juggernaut, and team events. We have many threads of new event ideas as well that you can look at and show your support for. We also have an idea for opening a server that is only special events and no normal flood rounds.