They can pick one faction that they grind and two factions that they PVP in. If corporation owns an outpost on said island, they can PVP and defend themselves without any standing hit.

Missions are available only on three islands of the six. If they are the aggressors, then the only thing that happens for them is that they need more time reaching the island. Once they get an outpost, they can set sparks up regardless of the faction standing.

For weaker corporations, it's a good thing. For stronger corporations, it doesn't matter, they are capable anyway.

I don't think it makes a lot of difference for a corporation trying to get an outpost on the island. They know the intrusion time ahead and the extra 15-20 minutes it takes to travel from neighboring faction island, despite not being able to Spark straight to Beta terminal, is not going to decide who is going to get the SAP and who won't.

The only difference will be that attackers will have a harder time scouting islands they don't have outposts on for potential targets. Reason is that if someone is continuously aggressive on some island, he won't be able to Spark close and has to walk.

There is absolutely no difference from the SAP attacking perspective, just gankers will have a harder time.

Anyway, you bring out our current political scene, but you don't see that Beta islands can hold only maximum of 2-3 corporations for the free, without standing loss PVP. Our current alliance consists of 7 corporations. If any of them PVP on an island they don't hold an outpost on, they will be losing standings.

It makes a huge difference for me if I can just jump over to ICS-B to attack all the SAPs, or got to go and run from Tellesis. On ICS-B I'm right on the field, while when I teleport you may catch me on those, for example, or see me jumping, etc. It's a totally different situation.
I'd say that's the risk when you want to live on a missionisland: The enemy has easy access through the NPC outpost (and should have), which ends in the risk to run missions on beta. There should be a larger risk, otherwise the rewards should be significantly lower.
Well I think a vet has a very much easier time to get his standing back up than a newbie has, even if it's just the time it takes to shoot/mine something, adding up with the relationskills, better equipment, etc..

Yes, I would say that's the whole point of risk in eprimining and living on beta. I don't know how you experienced the game, but when I started out, we were used to vets killing us in our little argano hoards, while we were trying to ninja mine epriton outside of new crimea. I don't see the result being very different from that, it just should stay a danger to be on beta and at the same time, it should be easier accessible for new corporations, to keep the game alive.

You are, indeed wrong. We need to take an outpost to be able to mine epriton, since we can not stay in T2 assault bots forever. I just the the big obstacle of getting it, first, which isn't easy in the first place, with SAP times being in the middle of the night/morning for the past days (hard if you don't have both timezones covered) and this would make it even harder.

even more worse for noobs that neither have the ep for the sparks nor the standing to set them.

i think it will make things just worse.

The main point is that if you are always PVPing on some island, you will not just get that relation up enough to install the higher sparks.

What it basically does is stop everyone from running around Beta terminals killing people and in return it makes life on Beta a lot easier, even for newbies.

In a nutshell it's a nerf to Spark Teleports for those people who use it for PVP.