Settings
Put MovementHelper at the front of this mod list in the launcher.
In Deed Mutators Selector, turn on Sudden Death.
In Special Powder, change Power to 12.
In Spawn Tweaks, turn on Infinite Ammo And 0 Heat, change Player Damage Dealt Multiplier to 150%.

How to
Everyone use grudge raker Ranger Veteran. Play in Cata Fow. No one use potion/healings.
Special Powder allows you to rocket jump with grudge raker.
Toss Me allows you to toss the dwarf by pinging them when you are close enough, can bind hot key for it in the menu.
Grappling Gun makes RV Ult function like scout grappling hook. Feet must be off the ground to attach. Has 4 second cooldown.
Aussiemon's Free Flight Mod helps you to get out when you stuck.
Deed Mutators Selector turns on Sudden Death, allowing host to instant die. Still need to be revived though.

Common Problem
If you stuck, use fly(/fly or bind a hotkey) and then use grappling gun once(press F).
If you respawn without knowing where you are, press Inspect Hero(X).
Host needs someone to revive him once he gets killed.

Demo