Not sure if this should go in mods or suggestions but here you go;
I was hoping that the <SelectedAbilityBonusOption> tag could be put within the <LevelMilestone InternalName=""> tag as this would allow you to grant a summoned unit new abilities as it levelled up.
However my experiment shows that if I put them in the level milestones the abilities just don't get granted.
Is there another way of doing it if not could stardock make this work?