[Zanthis]

Hidden WP:
Could easily be an option. Could actually be a three choice option:
1) Normal WPs
2) All WP outside your home system hidden
3) All WP hidden

I wonder, can you "cloak" WPs right now? Might be able too, but it would require you to get to level 2 sensors (at least). I wonder if you could use a cloaked WP if you didn't have the sensors to spot it?

Active/Passive Sensors:
There are 5 sensors in the game already: EM Active, EM Passive, Gravitic, Psychic and Temporal. Technically, that yields four types of sensors (EM Active and EM Passive are different Versions of the same sensor type).

So, if you have a really heavily cloaked ship and you entered an enemy's system, you could have active temporal sensors screaming like a mad and unless they have passive temporal sensors, they'll never spot you (or other sensors good enough to pierce your cloak).

You'd have to be able to toggle up to four different sensors between active and passive. I don't think it is impossible, or even very hard, just guessing it won't be seen in SE4. Too bad, I think it could work well.