• probably drowning you if you don't have a jetpack or jump boost
• faster armour and potions should override it and give it same speed as water

not a bad idea, might need to wait till 1.13 when we redo the fluids.

Nice idea, we might be able to add this in 1.13. this is because we plan to rewrite the fluids in 1.13 and it will be a good opportunity for us to add it then.