I really don\'t see any issue. I don\'t use mods because I find I get a greater sense of accomplishment when my crafts are built with vanilla parts. Does this mean I care if other players use mods? No, because it makes the game more enjoyable for them, and that is what this is all about - having fun. If someone wants to mod the fuel tank to carry 3238923490 fuel so they can make it to the moon with 1 fuel tank and an engine, that really doesn\'t affect anyone else. The simple answer here is for you not to use mods in career mode. Now if there were a leaderboard or some other factor which would be affected, this would be a different story. But as the game currently stands, with no one gaining an advantage by using mods other than their own personal enjoyment and satisfaction, there is no issue.