Frame shift traps
Use certain mined and refined minerals to restock auto repair systems. Make two repair systems
I think rather many from your list has been mentioned here once or twice, in one or another form. These 2 things still, I have not read about these before.
Repair system idea could be nice. Variety of different materials could be used, and some/different components needing different materials.
The Frame shift trap. It is more or less the same as interdiction, except the theory behind is different. I think this is a good way to force encounters for players. I would continue from here...
Make pirates to have this trap device, and then there is actually a device in the space. You have to destroy this FSD trap device, or it takes really long to jump again. This will force the louse Type 9 Palladium traders to arm themselves, finally.
I wrote to some other thread about this distress signals, and other players being able to jump in to help you. imo this would be a really nice combination.
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And yes, there has been ninja patching for sure.