Interesting ideas. I'm already considering adding something like the "drama point" from Hillfolk - you earn them for conceding some purely dramatic point; a promise, say, or forgiveness. Maybe these could be surges, too? Might work.
I forsee a bit of an issue when "each time you *spend* (as opposed to lose) a healing surge you get X" abilities. @
Manbearcat , do you find any need to increase the bonus at Paragon/Epic tiers? Surges seem to gain uses, then, anyway.
In a related system, I'm also pondering on giving APs for skill challenge failures. This might reduce the pressure to 'always use the best skill' while adding drama to challenges by tempting a "well, two failures is OK - we don't fail until 3" approach. One use of the AP might be a (harder) roll to cancel the failure, as per the Essentials skill challenge rules on edges.
Interesting nest of interconnected systems - needs careful consideration, I think.
P.S. I can't xp Manbearcat, either. Maybe some sort of repulsion field is at work?