Concoction NEEDS this

All Skill gems have Weapon Set choice option

But Concoctions do not have this option for some reason

Please, i love the Weapon swap mechanic but pressing the weapon swap button makes the mechanic a bit awkward.

Concoction doesn't use your weapon, so far as I know, so it doesn't tie into the weapon stats. That said, I presume you're trying to use it with a specific tree spec, yes? Mm. Does seem like a distinct weakness in the system. whether or not the skill uses the weapon, it should be allowed to pick which tree spec it uses if they're going to do tree specs.

I want to use my curses with increased effect/duration from the tree and cast speed from my wand/focus. But on my Concoction i want to attack using my quiver and bow that increase level of all projectile skills.

So it is very beneficial to use Concoction with a certain weapon setup as well as certain passive skills from tree that increase my damage and not my utility.