The label of 'micro-blackholes':
If approached to closely, there is a 99.99% chance of being sucked in....molecule by molecule. What? You thought it was gonna suck you in whole.
I think in the game Stars!, there was a particular technology where you packed together some of your minerals tightly and slingshot it from your planet to another planet. So you don't really need to find a 'micro-blackhole' to launch a big rock or something although it could give you more velocity and in the end give you a bigger impact that kills more people/do more damage. Yeah, that could be the difference between slingshotting around a planet and finding a blackhole to slingshot stuff.
Also from Stars!, does anyone remember when you packed in your civilians and dropped them on a planet and won and the message said "our victorious soldiers have won the day" or whatnot but if you got landed on and lost "your civilians have all been killed." Talk about double standard. One second they're soldiers, the next they're civilians. Maybe they should let civilians in SEV be a mob with pitchforks that you can send into battle.