Just to preface, none of this is in any way important. Just potentially nifty.
1) When you're at the main screen, you'll occasionally have ships wander by and/or attack each other. It'd be neat if there was, say, a high probability that the ship / variant you're currently looking at would show up next.
2) Weapons! Currently they just sit there. It might be neat to have them occasionally swivel and open fire on... something. Maybe passing asteroids; maybe some invisible spot that's just off-screen... For things that aren't multi-stage missiles, just having it shoot in a random direction (probably mostly up so it doesn't obscure any important text) might work well enough.