1) Moddable.
Simply make a second, normal tech area that requires, say "Massive planetary shield" tech, and have it give you even bigger shield generators.
2) Can be created by a dedicated human player.
5) See B5 mod. With random armor skips, you really don't want to have a single point of failure (bridge) take out your ships
6) Phased shields are moddable. Use "phased shield generation" on a facility.
Regenerators and crystalline effects would be a welcome addition