Just an idea I'm putting out there - I've not seen anything along these lines before: One of the main Stamina/Magicka Balance issues is that blocking and dodging comes out of the Stamina resource creating multiple drains on this resource for Stamina based builds.
What do people think of either; giving the choice of or assigning "dodge" and "parry" to the Stamina resource and "blink" and "block" to the Magicka resource? Each player using one or the other and can only be changed outside of combat, like skills.
"Dodge" and "Parry" would work as they do, drawing on Stamina. Possibly assigned to DK and NB as primary stamina builds. "Blink" and "Block" would be a short range, identical distance to dodge, teleport and a Magicka shield, both drawing on Magicka. These could be assigned to Sorc and Templar as the primary magicka classes. They would work in exactly the same way, but draw on different resources.
However you could just make this a choice per player as choosing Stamina as the resource for a Stamina based build would give you more resource to draw on, but with the drawback of sharing resources, whereas choosing Magicka as the resource would give less resource, but fewer sharing abilities.
I hope I have expressed my idea clearly and would be interested in your thoughts.