I like the idea of traveling to other worlds. But, naturally, if one does so and the worlds are inhabited by other beings, you can trade.....and that's about it. Instead, how about colonies? You go to an uninhabited world and start a colony....sort of like what you do here. Same basic procedure except....your home city can send goods, coins, supplies...etc. Of course they have to have a space portal, and transports, and the costs of sending the whole thing stored in their Interstellar Portal. And, naturally, they can never send more than the the new colony can hold -- that would be just "lost in space," wouldn't it?
So the change would be that instead of other races exploring your city, you would be exploring new worlds AND, then be visited pretty much in the same manner by guest races as that city grows. And once that city is large enough -- about chapter 12-16 or so -- it could send back stuff to your home city. In either direction it would, of course, take about 4 days to make the round trip so your colony would have to wait a bit for the fleet to arrive, go back, get more, and return. And of course you can only send so much. You are limited by the number of ships you can have since you have only so many places to dock them in your Interstellar Space Portal and each ship can only carry so much. Not the fastest "feeder" situation by design.
So, in the end you have a fleet of transports moving goods back and forth but at a cost in resources and time. There would be no speed up instants for this as magic works only on the planet, not in space, and while you could use the colonies as "feeders" it would take a lot of time, effort etc... to get to that point.
Now the pros are many as most of what you would do in your new city has already been coded. The tech tree, the guest races and all of it, is pretty much "transportable" to the new colony. Of course the new tech tree might be a bit easier since you've already invented/discovered it before on your home planet, and since you've already done the guest race before you probably recognize what you did and didn't do that you should not have done or should have done.
And there wouldn't be a Neighbors, Spires, Tournaments or FAs so there would have to be some kind of "credit" system where KP earned in the home world could be used instantly in the colony or colonies. Sort of like electronic banking.
AJ