General plugin for low gravity sniping

How would one go about creating a general purpose server-side low gravity sniping plugin for any map?

Something like, when map is loaded:

  • Change to low gravity
  • decrease the size of the players (makes the maps seem much larger)
  • Everyone spawns with good sniping rifle, translocator
  • etc…

Looking for thoughts, ideas, assistance, etc…
I have programming experience, but know little of UE4 engine.