The Original Campaign Set in 801AS is unavailable due to Compatibility issues.
Single player for me i used to trial new ships before buying them on the server as you can teleport to any base, give yourself endless money and any rep if you want using the inbuilt commands.
NPCs in game are nerfed to push the game towards player interaction rather than PVE so Open SP in 4.87 isn't that challenging even if you play without commands