Well, there have been a few things that I've always wondered, and one of the things is the Jarrasul. It is called the Evacuator, and yet it doesn't do anything of the sort.
What I propose in this regard is that the Jarrasul gains the ability to jumpstart populations if it is around when a planet is scuttled/killed. In other words, if you have a planet that is bombed to oblivion with a Jarrasul in the gravity well, with 100 population, the Jarrasul would be able to carry around that population (though you would not get tax as they are refugees). The next planet you would colonize however would instantly receive that population (even if it means going above the population cap) allowing you to instantly boost your colonization of frontier worlds or could give you the opportunity to actually have some population on dead asteroids. In this way, you could over time expand the population of asteroids and as such your income. Now of course doing so would do absolutely nothing to high population planets as you would be replacing 250 pop with 250 pop.
The way that this would occur is that colonize would have a similar function to what Resurrection does now..
With the upcoming release of diplomacy, the following suggestion would fit right in. Armistice on the Akkan has never been something I was particularly fond of. What if it did more than cause a local cease fire? In diplomacy, perhaps it could have the effect that if used in an enemy gravity well, it would greatly improve your standing with that faction. If you need an explanation as to why, you are sticking your super-expensive capitalship in their territory only to have it be there on peaceful terms.
The third thing is suggested because I think it got over-nerfed and I'm suggesting the buff of the other colonizers. Malice was once one of the most dreaded abilities in the game as it allowed Illuminator side beams and Destra hostility to deal near infinite damage to entire fleets due to propagating 70% of damage across infinite targets. For this reason, I suggest raising the target cap to a static 40, but have damage propagation at 25%/30%/35%. Perhaps now Malice would be used more and that people might consider using something other than SR or colonize. I mean, sure, occasionally you will find a Malice-based ship, but I don't think you would ever really need it with the way the game currently works. 24 targets is not enough to really propagate that much damage, and really, Hostility on the Destra is only worthwhile for damage dealing if it is working with Malice due to the fact that it does not stack. For this reason, I am giving this suggestion.
These are of course just suggestions. I have always wondered about the Evacuator and was disappointed when they killed Malice. Armistice though seems like it could fill a new niche in Diplomacy. Regardless, I would like to hear what people think of these abilities in these reworked forms.