There are several mutators adding quality of life improvements that should be included in the base game. Faster movement speed is one of them.
I recommend checking out Tamari's KF2 servers to see some examples. There are more improvements, but these are the ones I would like to see in the base game or KF3:
- faster movement speed during trader time
- team health visible on the hud
- vote to skip trader time improvments
- can be confirmed using the vote skip button, if bound.. instead of having to hold F1
- no more confusing it with player kick votes
- if a player voted to skip it will show a check mark next to their name in the team health hud
- improved chat
- better visibility
- icons and commands
- unequipped weapons visible
- your other weapon is shown on your back instead of disappearing
- probably something like the Backpack Weapons mod
- an icon for the second weapon is also visible in the bottom right corner (weapon hud)
- improvements for dropped weapons
- no weapon despawn
- weapon owner information (overlay on mouse over)
- when I pick up someone else's weapon, a message appears in the chat
- I can block and unblock my weapons from being picked up by others
- damage popups
- kill feed for big zeds
- when a scrake or fp get killed, they appear in the kill feed for everyone, so you are sure the zeds are down