Hey guys, just learning the game and I was wondering, in what way do you all.like to use threats and advantages in space combat as a GM?

You mean apart from the ones listed in the space combat chapter? There's always lots of things to do; malfunctioning systems, space garbage drifting into the way, cargo coming loose from its restraint in the cargo hold and banging around. Oh, and not to mention the OCD maintenance droid the PCs "acquired" from some Jawas on Tatooine suddenly deciding that something needs to be shut down for repairs, RIGHT NOW.

Also, re-locking of guided missiles

Awesome, thanks! I'm trying to keep the campaign I have planned very loose in terms of what can be done with advantages and threats (aside from the main functions), so I want to be ready for some improvisation but also know my limits.