The way i see it is, if it is possible , mod a tile that of course looks like the stargate, with it's purpose linked to spying. Once both planets in question have a gate, it gives both parties the lowest setting of espionage plus a small increment for economics (trade with said planet), then in time of war when you land your troop ship the advantage factor for the attacker could be increased or maybe a waiving of costs for invasion techniques.
IMHO, the actual use of the stargate itself would only really be there to compliment the mod rather than be the main focus of it. The races and the wonderful ships of Stargate are the reason for the mod, yes?
Remember, that alot of interstellar travel exists in stargate, ie, earth to atlantis is mainly traversed by ship. The ships still have and carry out their primary purpose regardless of the functionality of a stargate.
You use ships to take heavily populated worlds, you use Stargates for espionage and sabotage, so make it an Invasion Tactic! Make it destroy atleast one improvement and reduce defenses slightly. Makes sense to me. It could be available alongside Traditional Warfare in the Planetary Invasion tech.
Yes, but the gate provides a great economic opportunity as well, perhaps when at peace with a planet with a gate it boosts economics, trade and research (from technology brought back through the gate) as well as the mentioned espionage. Not too much as this would be too much cheese, but maybe the costs to maintain a gate could be higher too to offset these advantages. I think i recall Hammond saying 7 million a month to power the SGC.....
In the end, does the mod require a gate at all? Perhaps just create a building that looks like the gate and assign it the function of the research co-ordinator or someother 1 per planet structure.
No gate at all would work too. Just the ships and races would do me that's for sure!
Danielost, this game assumes a united earth, so why not just take it from there and build the stargate mod into this one. The two worlds ( galciv & stargate) don't appear to be too dis-similar and as such would not be too different from each other. I still don't see how a non united earth is relavent....The Ashen seemed to unite us in a very short time....
neilo you stay out of this
I seem to remember you saying something about free speach not too long ago,

explain yourself better and avoid the headaches.