The online racing simulator
(shop) 12 players in demo != "Full online racing support" ?
Don't know about open configs, but you also can't use layouts.
Updated, now it says "limited" with an explanation.

Quote from DarkKostas :Don't know about open configs, but you also can't use layouts.

That should be covered in "Custom autocross layouts".
Maybe have text "max 12 players" so it is clear what excactly is limited.
** Best answer **
Updated again.

"Max. server connections / racers - 16 / 12 - 48 / 32 - 48 / 32"

FGED GREDG RDFGDR GSFDG