Not sure I understand the problem.. the chat log starts warning you at 2 minutes and spams messages at 1 min, 30 secs, 20 secs and 10 secs. The 20 sec message shows up as a big yellow warning on the right side of the monitor, it's hard to miss unless you are AFK salvaging or something...
The one thing I would change though is penalty from salvaging/damaging attacking ships in those sectors... If my license ends and I fight off a wave of pirates, I get like 1200 rep boost from each kill but the overkill damage the pirates get can quickly remove 4-5x that. IMHO i killed it I should be able to salvage it, I'm saving your crappy empire, show some respect :P