my idea about a S1+2 server is S1 player can play all S1 cars and tracks on a S2 server but if the server change the track on a S2 lvl the s1 player would have to leave the server because they cant drive or they could view the race
here is my Initial D mod for LFS S2. It changes the background pictures and adds some Initial D skins (for example the AE86, R32, EvoIII, Sileighty ect.)