The best method and approach when using mods for any game is to obtain these through Steam Workshop. Files are scanned and checked for viruses and malicious software.
The other benefit is if you are hosting a game from a hosting provider by using the correct Admin control panel, the game and its mods can auto update if set up correctly with in-game warning messages about game restarting and so on.
In saying the above Steam Workshop mods are not available for Icarus and do doubt whether this will be a thing in the future.
Issues with Mods
Players do have problems that occur when using mods in Icarus.
This is NOT a game issue.
I see these when they pop in the stream and tell me the game does not look right, characters seem to be missing, not holding the right weapon, and so on. You also can see mod talk and issues that present when watching a streamer that openly promotes playing with mods by other players..
My Opinion About Using Mods
Just don’t.
Icarus is an awesome game and what makes it what it is, is the crafting grind, which can take you on different journeys, which is simply awesome. By making the game easier rest assured boredom will kick in sooner rather than latter because its the grind that makes the game for what it is.
Fast Travel Mods: These are not needed until Rocketwerz decides otherwise. These blow my mind, and I have to ask myself how bad you are at the game to need such mods. You can actually sprint fast around the map by using the correct foods in game. I played this way for the first 600 hours on Olympus and have viewers bamboozled I was playing this way.
There is also mount options nut the way I see it is that a Mount can be a liability in the game.
You also now have the option of crafting and using the hover bike, which can be transferred to any world map.
You are actually going to save a few minutes to cheese a game that has options on traveling around the map really fast.