S1, Moodyz, OPPAI, KiraKira, IdeaPocket, Muteki, Madonna, etc probably will not be on SLR any time soon. These are all owned by DMM which follows Primer (2004 movie) logic when it comes to licensing and distribution outside of Japan (with the seemingly one exception of a huge Taiwan site whose parent company they may already own a big stake in). Foreigners want it, but can't buy it so pirate sites proliferate yet they and others in the JAV industry can't fathom why piracy for their content is as bad as it is.
We periodically do ask DMM if we can at least show older content on SLR, but it's always a no. On the flip side, unless things have changed, the only real difference between a "S1 VR movie" and ones we show on SLR is the casting. The crews and gear are usually one in the same as a lot of VR shooting is outsourced (as is most JAV where production crews usually are not salaried employees but freelancers).