Hello!
Here's something interesting concept for the metagame to play with.
Think about this, imagine that no one can see what your actual rank (lvl), unless you destroy them, befriend them, or be in the same fleet / alliance with.
This would make the pirate mode even more exciting for new players, being in pirate mode would not only mean that you'll be exposed to anyones wish to challenge you, but also to players which their actual strength is unknown.
The lvl is a way to show how far your firepower extends. Now imagine that that information is unknown to a PK (Player Killer). You are on Lustra, helping a friend with some missions, and this guy appears and he has Mizar tech, now, if he would know your actual lvl, he will leave you alone, cause they don't want to mess with someone bigger, now let's imagine that he doesn't know what your lvl is, he just supposes that you are another low-lvl player, and kills you, then you just drop this on the chat "This isn't even my final form." and.. well.. you know what happens when you mess with a big fish xD.
Anyway, i'm not suggesting this, i'm just saying that this kind of silly-sounding thing can make the game so much more fun and enjoyable, there's barely no metagame in the game, a few years ago, most of us thought that the Sirius Long Accel was't a bug, but a metagame thing, something just the most experimented ones know about, and even if it was a bug, it was something that people would get amazed with, skills that only a few knew, like that one time when the Gazica's best inhibitor was even more effective than the Sirius one.
I'm not saying that you should add bugs to the game to make it like this, i'm just saying what i said before, there's barely no metagame, something like using 2 skills at the same time make them more effective than using them by separate and stuff like that.
There's a rumor about the sniper cannon, at least in Aurora, and is that if you are standing still, and trigger the snipper cannon at the same time as you start to move your ship towards the enemy, the blast from the cannon will be a crit, cause it has this "Lancer effect", so far it's only a rumor, but imagine if it were actually real, this kind of stuff would make the pilots lose their nuts, not to say that it will change the pvp / pve strategies alot, but this is where the fun begins, you can't tell your players that that exists, only a few would actually find it and know about it, cause they were the only ones to try it out, to try something new and see a new effect never seen before!!.
I don't know if there's any hidden kind of metagame in the game, but after playing for so long, the only things that looked like that were those mentioned before, the bugs and the rumor.
Anyway, it's just something to have in mind, metagame can be silly things, but those silly things have a huge impact in the playerbase.
I know i haven't explained myself good, and i'm sorry if someone got confused, i just hope i explained it good enough for you to get the overall idea.
Anyways, have a nice day!