For instance, they're going with 3 methods of FTL travel. When the game comes out, I won't be surprised if within a few weeks people started modding in new options in addition to those, or if an expansion takes that and increases that number while simultaneously making the existing ones more nuances.
That's a no-brainer for sure. They've already got:
1. Battletech style (Ship-based, outside system gravity well, high cost, recharge time, limited range, unrestricted destination, non-instantaneous)
2. One-way Gate-style (Infrastructure-based, outside system gravity well, single-threaded, unlimited range, unrestricted destination, non-instantaneous)
3. semi-Honor Harrington-style (Ship-based, no gravity well restriction, restricted destination, range delineated by natural distribution of systems, non-instantaneous, conceptualized as "lanes")
That leaves plenty of options. You can go Starfire style and have naturally occurring paired wormholes which connect instantly but which are easily defended choke points; Star Trek warp drive style and allow ships to travel without a set destination system albeit at lower speeds; maybe even throw in a generic point-to-point hyperdrive which can only navigate to previously visited systems, meaning that you have to send ships out on blind jumps to discover systems, randomizing their destination with a spread weighted by distance from the starting point. Shit like that.
But yeah, if that sort of thing is moddable then the game is ripe for total conversions.