Some of that has been discussed quite a bit internally...

Here are a few of the problems...

Trade earnings are based on the distance of travel. If you could instantly jump from a place 25 sectors away to your destination planet should the goods be valued the same. The ultimate answer would be no. Since the demand would be low on your home planet for goods that could be acquired quickly.

Calculations for the trade routes were put in place with the time it takes to travel from one sector to the next. The larger the distance the higher the value of the cargo. I can't recall of the top of my head, but with the proper trade skills in place, and ship upgrades I think it would out to be about 27 sectors (give or take a couple, due to my bad recall - since I don't handle the trade calculations).

With that in mind if we were to add jump gates in to the mix we would have to try to figure out distance traveled, using a jump gate. Now I'm not saying that won't change in the future, but for the time being we decided trade ships with cargo can't jump. Let's say they don't have the special antigrav shipping containers needed to make the jump... perhaps they will be manufactured in the future.

As for question #2, can you use an allies jump gate... no... that was another topic that came up quite a bit. While currently their is no formal "alliance" structure in the game. Basically the diplomacy is.. I won't kill you, you don't kill me.. deal? So with that in mind we don't really know who your ally is. Which brings us to a bigger thing...

We have been working on diplomacy trees, and trying to come up with what we call a diplomacy victory. It's in it's early stages, and as we get further along with the idea we'll run it past everyone and get some feed back as to what people would like in the diplomacy part of the game.

Another option we have discussed is maybe having it so players can "charge" players to use one of their jump gates. If I had a jump gate built, and you wanted to use it, you would have to pay me <x> rare, or common ore to use it. Of course I would be able to set different rates for players, so if it's someone I like I can charge a lower fee, or make it free for people.

Those are just a few of the next step thoughts in where the game is going, or things you may be able to do in the future. We'll have to see what people like dislike, and then look at what it will take to get the game to where the players would like it to be.