When asked what kind of space travel I would be using for my game I simply said .....yes. All types of space travel are available (not necessarily to the players) and each is used for different purposes. Stargates (ala SG-1) are used like airlines just no plane. Warp is used inside one's own galaxy, Jumpgates are used like intergalactic tollways and you have to pay to use em, Spacefolds are Military only (rarely used by non-military) and those really cool looking space gates in your pic would be used primarily for commercial vehicles and possibly recreation like highways (for a fee of course.)