[Suggestion for Presence]

Since tanks don't need any help with their solo ability, and Presence is useless in any situations where you don't have your companion out, all this would do is potentially reduce the number of gear sets a tank has to carry around. Which isn't really worth blowing talent points on.

 

Then just give tanks a boost to threat based on presence with no talent required.

[Suggestion for Presence]

It seems to be widely agreed that presence is pretty low value. To make it more useful, you could give tank specs a talent that increases threat based on presence. This is actually (in my mind anyway) a fitting use for presence.