1) Got it.
In order to warp, they must be tiny ships, can't be targetted by PD, can't be carried... that's an ES
2) Got it.
See BattleMoons
3) I thought I had it
Rather than increase sensor power, I'd make mines scale up in cloak strength as tech proceeds.
4) Need it.
An expensive, weak, invisible ship. Forces the enemy to keep its planets defended. Minefields could deter them though...
5) Hardcode.
Need more intel modding options.
6) Got it.
Tachyon/Ion/NullSpace mines. See P&N
-----------
The HomeComing Scenario was a game I played right from turn 1 until I got the plasma instability message.
Playing as a neutral was fun, and now you've got to deal with the consequences
For the scenario Messages, I just reverse engineered the Tutorial for.