While this is historically fun to do, you have to barrel snuff elites in a horde with a longbow to make use of the “kill an enemy, get a free extra projectile” ability, toggling back and forth to keep your ranged attacks up. In order to run an actual ranger build on Kerillian’s ranger class with this talent, you would need to run longbow. She can’t really combo this talent with the shortbow at all since having an extra shortbow projectile is insignificant damage, and the hagbane already staggers everything (non-boss) in the game on the first hit, so the free attack would also largely go to waste. In particular, she has a talent where melee kills grant her a free extra projectile on her next ranged attack.
Being a ranger class, I think the talents that make her be ranger could do with revisiting. I’ve seen far fewer waystalkers played in my games since the patch, probably because the class no longer has a crit talent and you more or less have to build her as an ultimate-based build.