If I may make a suggestions, would it be possible to put some kind of way to show another fleet's alliance before it comes into view? For example, a small toggle-eable window that shows the current diplomacy states with the fleets in-system (Hostile/Neutral/Alliance/Friendly), or a tooltip when hovering over a faction's fleet?
Not yet, but perhaps with StarSector 0.6

Additionally: a manual trigger for station attack fleets to attack a point would be great. It's kind of annoying seeing station fleets depart for utter failure when you have another faction's station locked down with fleets.
Yes, StarSector 0.6 might allow me to implement this the way I want. Otherwise, I might just end up adding a item like "attack beacon" that you can place at a station to cause your ships to target there. We'll see.
Some suggestions.
Suggestion A:Faction conquer a station by a lot of 'Attack Fleet'(include player fleet or not).If a station is attacked by 4-8 more Attack Fleet and its Defend Fleet is less than 2.If this situation last 5-10 days,then this station will be lost.
Reason of A-1:This can make player's fleet more (a bit) useful on station attack/defend instand of just killing fleets.
Reason of A-2:I can't be patient by waiting for a stupid/slow/weak fleet to attack a station!
Suggestion B:Will you add a special faction just like TradeGuild which is used as 'Pirate'?Not the faction appears in original statrsector,but a faction hostle to all other factions.It will appears sometime by time/by some math fuction/by otherthings you like.It will attack mining fleet,supply fleet or even station!If a station is conquer by them,then this station will be abaddon.
Reason of B-1:Add something that 'unexpected/surprising/WTF!'.
Reason of B-2:There must be some crazy guy.Carzy than rebel.They just want supply/ship/win/yourlife.
Reason of B-3:My Fleet is powerful!No one can Defeat Me!I am the Dominator!!!!!Wait?Who is that???
Suggestion A: Yes, the station takeover process will get a large revamp at some point that will include a method for the player to take over stations. I suspect the idea of specific boarding fleets will carry through (I like the idea of having to outfit your fleet especially for station boarding) but we'll see.
Suggestion B: I was thinking about this the other day

It probably won't happen to after StarSector 0.6 but there will be a faction (or a number/group of factions) that will perform the role of a universal aggressor. Think the Shakuri in Distant Worlds.
Oops, found a bug. A faction previously neutral to me joined an alliance with an enemy faction, and sent attackers and boarders to my station without actually changing to hostile.
Thanks, I'll put up a fix soon.
If you attack a member of your own alliance, the alliance decalres war on itself, and the attacked member leaves and becomes hostile to the alliance. If the alliance has 3 or more members, the non-attack members and your faction stay in, but the other non-you members become hostile. Its, very strange.
Thanks, I'll check it out. Just out of curiosity, are you playing with the latest version (0.57)? (unfortunately I forgot to change the version number in the mod so both 0.56 and 0.57 both come up as 0.56

so if not sure it may be best to re-download the mod files from the 0.57 link)