EDIT: Implemented in version 0.6M

We can set the cars list by /cars command, and we can even limit cars per each user, but we can't get the list of the cars enabled on the host.

Am I wrong or should I create another RFC for that?

No, there isn't.
I started a thread already : https://www.lfs.net/forum/thread/86670

You are probably wondering how does LFSLazy get allowed cars and displax them in car selection menu, answer is LFSW host data.

Quote from DANIEL-CRO :

No, there isn't.
I started a thread already : https://www.lfs.net/forum/thread/86670

You are probably wondering how does LFSLazy get allowed cars and displax them in car selection menu, answer is LFSW host data.

Oh thats was so long ago and yet no answer

Using lfsw info for that is not really a good solution for host control insim program, since there is no way to check the info of hidden or /usemaster=no server.