How about a sub light fuel gauge for fleet ships?
What happens when you are coasting, though? Does fuel get consumed? It would have to, or else you could coast to victory. If fuel gets consumed no matter what you do, this is essentially the speed normalization idea I mentioned.
I believe it could be handled a few different ways, much of which would be dependent on ship type...
All* ships would continue on in the direction at the velocity they were moving at prior to losing fuel, at which point they would have very few options to slow down or change course. For example maneuvering jets or said equivalent and use of a cannon like the Druuge to obtain velocity in a different direction. This could lead to an interesting win scenario by getting your enemy's ship entrapped in or destroyed by certain Gravity Wells "Suns, Planets, Black Holes, Etc"
*All Ships being defined as those following what resembles known physics. Any ships designed to move via a method outside of our understanding of physics is left up to the developers prerogative.
Pyro's idea of slower ships having more travel range is interesting too, although I'm not sure speed and a fuel-limited range should necessarily be correlated. Maybe this idea could be yet another type of "fuel limited" play mode? My real desire with this new generation of melee would be to have lots of option customization, to the point that players can decide which handicaps they'd like to enforce when the match starts, so if they don't want to play "standard melee" they can basically create their own little custom game modes with whatever house rules they want.
this was just part of my mind set by a mesh of different technological lore from different games/shows.
Huge ships outside of those specifically designed for war would tend to balance Life Support, Speed, Cargo Space, Weapons and Protective equipment to varying degrees.
IE: Colony Ships, Precurser Utility Ships, Death Star, Massive Cargo Fleet
Medium & Large sized ships aka the ones we would be sending into battle
I won't say much, the ship design ideas thread is pretty awesome & fleshed out.
Tiny ships, this could be anything from planetary exploration to ship to ship combat dogfighters
With the dog fighters generally you find them as fast / agile / short range with minimal protection and designed for hit & run tactics in short battles.