Fusion rockets, and other alternate (slower) types of propulsion would be a really nice addition to my current game. Although I've juggled around a slower max speed and top acceleration.
But yeah, something akin to, for instance Proxima or the Expanse series, could be really cool.
Other types of starship types could include:
- Scavenger ship
- Exploration vessel
- Asteroid mining vessel
- (small) frigates
- Customs/inspection types ships ... not sure how you would classify them
- Breaching pods/troop ships
Those are from the top of my head. And mostly space-faring vessels. There are of course ground and air vehicles. Pods. Mechas ... like the one in Alien, or the ones in Avatar.
Additionally, a system for customisations and modifications of said vessels. Like standard upgrades, replacements, fine-tuning, etc. Would be ace. Of course most of this is covered by the rules in a way, but perhaps suggestions, stats, cost, showing what's available.
Rules for cryo-sleep - if such a thing is already covered and I have overlooked it - and long distance travel with slower and different propulsion systems. Reading
Proxima at the moment, they got some different kind of propulsion from magneto gravitic, but also different from the Epstein (?) drive from Expanse.