I like these two ideas. I agree with Schem the second would need heavy restictions or players could protect the homeworld, or any other world for that matter, forever.
I especially like the minelayer idea - of course you'd also need a minesweeper   
In fact, why not be able to lay mines around your planets, and they would be invisible to others unless they had detectors on the ships. This might also give you a way to funnel ships through your gravwells.

How about an interdictor, stopping mid phaselane creating a gravity well to launch surprise attacks?

Great ideas, how about make sure that any units that phase induce + the battleship itself should also be given an option to retreat back to the planet they came before it collapses.

This seems pretty good, except the two slots is a bit steep. Better to have it take tactical slots I think, maybe 10.



This seems a bit iffy to me, as others have said. You could attack any system from any system, even if it did take a while to get there, it would greatly limit the strategic importance of dead asteroids. There wouldn't really be any reason to take them if they can just be bypassed. Currently the only thing they are good for is as choke points to build defenses on.



This idea I like a lot. Make a proviso however that it can only be done when at least one end of the lane ends in a friendly planet, that way you won't have to worry about people mining lanes between enemy planets. Being able to mine between an enemy and a friendly would of course be ok.



I think this function is covered well enough with your first idea. Why would you need a planet structure that does the same type of thing? Plus as others have said, you could spam them and protect a system indeffinately. Perhaps if you made the ships that do this very expensive, and take a lot of supply.....

Maby u could drop mines at the exit or entrance of the phase lane that way you wouldnt make any problems because blair said the while ships are in phase space they cannot be interacted with so mines wouldent do anything but they would at the exit and entrance you could also have a mine sweeper ship that uses antimatter to kill mines and for the diffrent races like vasari phase mines which do loads of damage but are expensive and only a few of emm and maby u could have the construction ship make emm like a diffrent type of def and for advent maby like psi-tech bomb which dose loike a shock wave doing damage to all ships in a radious and conventional mines for the tec which dont hit hard but there are alot of mines and they are cheep