Wish that when selecting a skill you could choose if it is powered as mag or stam. I would even accept that you have to make that choice for the tree so that all skills in that tree would use what you chose. No more would there be morphs that shifts what is the base. The morphs would just be all the other tweaks such as direct or aoe... etc.

Of course you still be able to change using the skills respec. As I am writing this I think I favor making it skill tree based. You would have to respec the whole tree in order to change the power base, making it more of a gold sink than per skill.

The purpose would be to make it even on the choice of mag vs stam. This would be more of a players choice of style. If the devs feel strongly about some skills should be better when using either mag or stam, then they could have more variations of cost & damage for the different paths. It's a matter of how much more the devs feel they want to put into it and could help to keep from having one stop Meta's.