The Dominion are supposedly an ancient Empire that has been around for at least 10,000 years. (Don't quote me that coz I don't know where I heard that though

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They conquered or allowed other races to join them, and they became a vast Empire that eventually spanned an entire Quadrant. They were brutal and used "genetic improvement" to create races that met the needs of the Founders exactly. Any deviants were executed. For all intents and purposes, they were essentially an "anti-Federation". (That was what the writers wanted them to be, and if they'd had their way there would have been a LOT more Dominion races, but the producers and accountants didn't like the idea and the Dominion ended up becoming the Founder-Vorta-Jem'Hadar triangle that we now know them for)
Anyways, this is my understanding of how the different races will play in the game(s):
The Federation will build multi-role ships with excellent systems and experienced crews - which makes their ships the most expensive to build and maintain in the game - but individually, they will be "the best". The Federation will use diplomacy to win races over - be that by credits, peace talks, humanitarian missions, or war.
The Klingons will be armed to the teeth. Their defenses may be weaker than those of the Federation, but they will make up for that in pure combat readiness, maneouverability, and combat speed. They will get greater experience bonuses than the other races. The Klingons will expand by spreading the glory of the Empire further by fighting enemies that are equal to or better than them, enslaving those who do not wish to fight, and using diplomacy if all else fails.
The Romulans will have large, lumbering, ships. They will have powerful weaponry, although not necessarily as many weapons per ship as the Klingon designs. Some of the smaller Romulan designs will be almost as agile as the Klingon designs, but they will (Almost) all have the Cloaking device, making them dangerous enemies ineed. The Romulans will be a secretive, enigmatic race, who will only use diplomacy as a last resort. They prefer actions to words, and will use their exceptional intelligence methods to weaken their enemies before going in for the final strike.
The Cardassians will be the "poor mans player". Their ships will be rigidly efficient, and will be the cheapest to maintain in the game - but they will expensive to build in the first place. Their ships are designed to take massive internal damage before they are finally destroyed, and they will have good firing arcs and weapons. Individually, their ships are weak, but in numbers, they will be a force to be reconned with. They will expand by any means necessary, although force will be their preferred option. They will enslave anything that will be of use to Cardassia, and destroy the rest.
The Dominion will rely on two types of specialised ships - hundreds of the throwaway "bugs", and a small number of supermassive heavy support cruisers. The bugs will aim to cause as much damage and confusion to enemy ranks as possible, whilst the heavy cruisers lay down cover fire and attempt to decimate the larger ships of their enemies. The Dominion will be "alone" in the Gamma Quadrant - they won't have early-game victories, (Unless you're an aggresive player that expands straight towards the other Empires as fast as possible) but will instead spread across the Gamma Quadrant - like a plague. The minor races in the Gamma Quadrant will surrender or die when the Dominion get near, and their 200% ship building bonus will mean they will pump out hundreds, if not thousands of combat-ready ships. This great advantage is offset by the fact that the other races wil have had thousands of turns of infighting - leaving only one or two super-powerful Empires with lots of highly experienced ships to take on the might of the Dominion.
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The game is going to come in several different styles - canon, (Everything will be roughly where it "should" be) semi-canon, (Everything will be within a set area, with a small amount of randomisation to make things a bit more fun) and completely random. (This will be the most commonly played map, and don't think there will be any point in explaining this one!

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IF we were going to set it so that the Gamma Quadrant could ONLY be reached via a Wormhole, this would take extra programming. We'd essentially need a physical wall around the Gamma Quadrant (Which I don't like the idea of) or we'd need to have two separate maps - the main one, it would be "L shaped" and would be the Alpha, Beta, and Delta Quadrants - and a second map, which would be the Gamma Quadrant on its own.
Whilst the second option would be the coolest, (If you can do that, you could then try one for Borg space, Fluidic space, and so on

) it would take a lot to program, would mean extra buttons would be needed on the interface, would be more difficult for player to keep track of systems if they are on multiple maps, would slow down the game (It would likely require a lot more procesing) and would just generally complicate things.
My personal choice is to leave it as it is, and just have the Gamma Quadrant like any other Quadrant. If people really wanted to keep things separate though, one possible compromise would be to have really HUGE maps.
