They have already paid for lfs development, you paid an extra £12 to get access to extra cars and tracks.
By your logic fuel/pitstops/tire ware/and the updated s1 tracks should be denied to thouse with just an s1 licence.
And I would be happy for this to be true as the old version of s1 still exists, the problem is that s1 got one last makeover which just happend to use the same code as the full s2. The s1 people have got a free upgrade allready you will never know if your racing an s1 driver or not. So I really dont care if s1/s2 drivers can mix.
Maybe the s1/s2 seperate content should be gotten rid of. You want lfs in its current state it will cost £24 no Option to buy just part of it or old versions.
Hey I really like this idea,should be quite workable.
s1/s2 differ only by content its not like a 2004 vs 2005 edition of a game so.
A race at blackwood that allows all cars(or an s1 car) will allow s1 people to join and race with s1 cars, and they get to see the new s2 cars going past them in most cases.
s1 drivers cant join s2 tracks or servers with s2 cars only allowed.( not even to watch s2 cars only; at an s1 track)
There is no need for server options to set s1/s2 mode, in fact you wont need to alter the server code at all. The client will decide what car and track you can use. It does this allready so there is no added security risk.
s2 users have no more right to race with an s1 car at an s1 track than s1 drivers, I dont see why you want to kick them for an s2 driver.
Remember you pay for added content not privilege, no first and second class citizens please.
None of this s1 drivers connecting to an s2 track and being able to spectate, they can see the track layouts and the car specs at the main website.
If you start to think of s2 as an expansion pack you realise that this is way it should have been in the first place.