Interactive and Dynamic Map Elements?

I think I'm interested in attempting a map one of these days; I've made something in the Hammer editor for TF2 once before, but never worked in UE .. are they fairly similar?

Before I decide for certain what I'd like to go for, I really must know what kind of elements are possible in a KF2 map. Specifically, I have a real fondness for maps with dynamic or interactive elements (and it kind of saddens me how static all of the official KF2 maps have been so far..) . So what is possible?

• Elevators and other types of Moving Platform?
• Automated vehicles like mine-carts?
• Environmental damage?
• Falling objects?
• Moving objects with a specific amount of weight or force output, IE something that would knock over a Clot but not a Scrake?
• Triggers that sense players or zeds, or weight?
• Displays that show a camera point in real-time?
• Displays that show a spectator cam?
• Moving or toggling on/off Zed and Player spawns?
• Having the Traders cycle in a pre-set order instead of randomly?
• Simple interactive panels (ie use button while facing panel)
• Complex interactive panels (individual buttons, require aiming precisely at one to use)?
• Interactions that give or take cash?
• Interactions that give health?
• Interactions that remember a player or target a specific remembered player?
• Conveyor Belts?
• Launch pads?
• Pre-set or On-Trigger specific weapon / item spawn?
• Custom BGM (overrides normal soundtrack)?
• On-trigger zed spawning?
• Spawning of zeds that don't contribute to wave total?
• "event-specific" pathing for zeds, IE making zeds walk a certain path or behave a certain way based on a trigger?
• Forced zed erase from areas or forced zed teleport?
• Water? (as in, does KF2 support it at all? I doubt there are swimming animations for anything.)
• Dynamic/Triggered changes to ambient lighting / environmental effects, IE fog, smoke, or weather?

Interactive and Dynamic Map Elements?