Some topics keep surfacing, getting hashed through in new forms by new people, and then getting carried out with the tide of other threads. I suggest that tthe topic of "suggestions" is too broad. Let's take the subjects that won't die and give them their own forum-space.
Geology: Planetary shape, Gravity, Composition, etc.
Biology: Creatures, Aliens, NPC factions, things that want to eat your ship or gnaw your leg.
Industry: Elements, Factory componants, Recipes.
Physics: Game mechanics and balance.
Engineering: Ship and station functions and componants with sticky threads for Propulsion, Weapons, and shielding
General: Everything else.
Geology: Planetary shape, Gravity, Composition, etc.
Biology: Creatures, Aliens, NPC factions, things that want to eat your ship or gnaw your leg.
Industry: Elements, Factory componants, Recipes.
Physics: Game mechanics and balance.
Engineering: Ship and station functions and componants with sticky threads for Propulsion, Weapons, and shielding
General: Everything else.