yeah it's hardcoded. I found in a
poast that there's a bunch of objecttypes options such as "$Allow Checking Cargo:" (which I assume is what I want), but when I added "$Allow Checking Cargo: YES" the parser complained, so it hasn't been implemented. Looks like antipodes 10 will be The Big Objecttypes Update which is when I imagine all this stuff will be added.
Droid: "scannable" probably does something slightly different than "allow checking cargo" because scanning and checking cargo technically are two different things. idk, FS is weird. Dunno why this is even an objecttypes flag when it could be controlled entirely from within FRED.