It would be nice to have Flares during those night time raids, allowing you to bright an area up.
This would be interesting, if brightness affected shooting accuracy. As of Alpha 16, being in darkness no longer increase's cover nor does being in light make you easier to hit. For the looks and atmosphere, it would be an interesting addition, but it leaves one pawn with a useless weapon in the end.
And there was already Flare Gun, called Incendiary Launcher.
I was thinking that you could use a flare gun to call in for military aide instead of using the coms console. It wouldn't really change much but would be a cool thematic thing plus it could be used to direct the aide in the right place because those people who come to help never know what the hell they are doing.
Flare gun could work well with the Realistic Darkness Mod