There was a mod back when I first started playing SoaSE called 'Phase Scouts'. It allows a you to research an ability that all scouts could gain. Once it was used in a particular system it was permanent, which I love. But it made it so you could jump from any gravity well in a star system where the scout had used the phase ability to any other gravity well in that same star where the ability was used. I love the mod so much I dont patch my SoaSE because it doesn't seem to work in v1.15.
The concept the guy that wrote it stated, and I like and fully concur, is that space is wide open, and once a location is known you would not have to take a 'Phase Lane', or even several of them, to get to that gravity well any more. I wish dearly someone would update the mod to work with the current patch. But oh well, lol. I dont play it that much anymore to worry over it too much.
If you can't find the mod and want a copy of it let me know and I can put it up on my web site for a few days so you can get it. But it may still be available somewhere.
edit: btw, your idea about jumping from well within the gravity well to another point would go WONDERFULLY with 'Phase scouts'.