1. Suggested before, and I will still turn it down. It can accidentally trigger during a Last Guard Kills All event, or at a point where several RED's are being idiots and all have to die by someone's hands. That someone would then be marked as a mass freekiller and be wrongly punished for it.
2. I've had this idea rattling around for a while, actually, but I've no idea how it'd be implemented. Basically, the player can type /endmusic or /em in chat to open up a menu that provides them with multiple end-of-round BGM changes (similar to CS:GO's system). The track would only be heard by the user, which would make it basically a mini Soundcloud plugin. I'd like this idea if it's implemented the way I described.
3. Most custom maps on the workshop, GAMEBANANA or other community addon sites are already in the map pool of our servers depending on the gamemode, I think (sure as shit ripped ever single GAMEBANANA Jailbreak map, that's fa' true). It's hard to find maps that aren't already in-use and/or reserved for a specific community server. If you have a map you'd like implemented that isn't on the servers already, make a thread with it with the file attached.