+1 for the ability to tag tasks !
Using the note tags is not ok to me.
This approach works against the evernote's task feature philosophy, which is "make your notes actionnable" by inserting tasks in it. If I have to move each task to its own container Note, then it becomes isolated, I loose the context of the original note.
Off course I can reference the original note from the task-containing notes, but it is cumbersome to navigate across notes.
FYI: My current work-around is to include "tags" in the task title using this syntax: "#priority <task description> #tagA #tagB"
Then I can filter tasks by tags just using the search field in the tasks panel (typing for ex "#tagA")
And ordering the tasks by title allows to sort them by priority (#0 is the higher priority)