Thx omegaweapon but I've been there already, I've tested all these options and completing the rts ones is not a problem. 
Liberatig systems does indeed free some more missions but the question was for that point where you've done almost all of them (and I mean I'm left with only three assasination missions that I can't get anywhere for 10 years already). 
I've even remained on the same planet and let the turns go, checking every two turns for a whole year...no dice.
		 
		
		
		
		
		
		
		
		
	
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