All this "bring sustain back" makes me wonder : what in the world are you doing with your pets ? I play intensively and the last time it died was like , 2 months ago ?! It's not like smn doesn't have bigger issues that need to be adressed in priority, please don't distract devs too much with that.
You need to tank smthg ? Find a tank then (or level one), is it not a mmorpg ?