Something that always stands out to me in video games is how players can swim fine while they carry 100KG of equipment, now I understand this is for game play reasons but for Rust I believe this can turn into a more interesting game play mechanic.
The Idea in a nutshell:
Depending on total weight of items on player determined the distance the player can swim before drowning.
How this can work for fun and extended game play:
Players will need to figure out ways to get across bodies of water, such ways could be to build a form transport such as a raft or to build a bridge across.
With players building bridges it would make for a good land mark for new players and also adds a dilemma to all other players whether or not they should destroy the bridge or use it for their own crossing.
I’m keen to here other peoples thoughts on this.