Another way to make PJI work is to make them interdict a fleet but only for limited time, maybe 30 seconds, unless it is destroyed in that time. It could be a second or third level ability. The first level does what it does now, slowing down the cooling down before a phase jump. A second level will slow down the cooling down further and a third level is an activated ability that interdicts a fleet for thirty seconds. This way if we have more than one PJIs, then we can activate them in sequence. Any opinions?
Personally, I don't like this idea. It requires micromanagement (the less clicking I have to do, the better), and it is too complex in terms of multiple levels of research, slowing down cooling times before phase jumps, etc. When possible, I am usually in favor of the KISS principle (keep it simple, stupid). That works best for me as a player, and it certainly works best for the developers in terms of development.
I am in favor of what the OP wants at the top. The excuse I always hear for not doing this is that people are worried about someone turtling back in their empire with a superweapon. I don't know why that should be a worry - if you take out the phase jump inhibitor you can proceed further into the enemy system. But bottom line, you can always nerf the superweapon. I think it is a no-brainer that if anything is gonna get nerfed, the superweapon should get hit with the nerf bat over the PJI. I mean, what is more important to game play dynamic, strategic use of phase lanes and star systems, or some stupid superweapon?
This may be too much trouble for the devs, but it might not: When setting up a game, make it an option to drop the PJI and maybe superweapon too. That way they could make the PJI the way the OP describes at the top. Those who want the current game play dynamic could just drop the PJI and play without it (which is essentially what they have now - a useless PJI). Those who are concerned with someone turtling with a superweapon could just drop the superweapon (this is assuming it isn't nerfed while buffing the PJI).