It's 2096 in my current game and I haven't had a combat challenge for decades. The local 154 race doesn't pose a threat to even my worst combat fleets. They seem to be a couple techs behind me at this point.
So I went and turned the invaders on in game options and was curious if doing so mid game actually works? Will they eventually show up?
Also, I've heard talk about various "spoilers" afaik, I haven't come across anything other than basic NPRs, 3 to be exact. I've explored at least 50 systems (~edit, make that 126), just curious if I'll eventually start encountering some more capable enemies.
Does PDC deployment time matter? For instance, if I wanted to put a simple AMS base on a automated mining planet, can I use a PDC for that or will the deployment time tick down?