Gotta tell you--SB is the first method in 51 years (and I've tried LOTS, believe me!) that has me exercising daily, building up strength...and, while I'm at it: remembering to floss daily, pray, take my prescriptions correctly, and a host of other things I usually forgot. As a side effect, I'm also getting more chores done around the house and yard--'cause now they earn me points. YIPPEEEE!!

So, yes: Wider Application of Superbetter. I find myself wanting to make quests that don't quite fit the 4 strengths, many of them financially related. The current strengths are all internal, and I can see why you might want to limit to that...yet, improving your financial health doesn't quite fit under mental, emotion, or social (and certainly not physical). The game would be a wonderful fit for a financial power pack, though...things like:

Quests:
-make a will,
-pay down debt,
-research money savers (how could you save money on what you buy?)
-save money on a bill (take one bill a month and try to whittle it down...use a different provider? request a better rate? use less of it?)
-Reduce, reuse, recycle (avoid buying something you don't really need, repair instead of replace, if it saves money...or find a new use for the item)

Power packs:
-Keep the change (save your end of the day change for a rainy day)
-Need or Want? (before you buy anything, consider if it's a need or merely a want...and can you put off buying it for now?)
-Organize your cash (oddly enough, keeping your cash in numerical order, flat or neatly folded, improves the way you feel about money)
-Walk On Bye-Buy (in a store, avoid looking at things you don't need but often buy anyway. I do this when passing a rack of Sour Cream and Cheddar Cheese Ruffles...it improves your willpower with repetition).

Bad guys:
-Fight Fast Food (no Starbucks, McD or other FF for the day)
-Impulse Buying (buy nothing that you haven't thought about for at least 48 hours first, or put on a list ahead of time)
-Ignorance is Bliss (find out the specifics of one area of your financial life: amount of debt, interest rates on debt/investments, monthly ins and outs, etc.)

These are all just quickie ideas, brainstormed in 15 minutes; I'm sure you could come up with more...but see how they don't fit the strengths very well? And there is a HUGE audience of folks who need to improve their financial attitudes (and standing).

Environmental--we're talking feng shui, here, sort of. Decluttering. Housekeeping: a word that's developed some pretty pedestrian connotations...yet who among us doesn't feel better walking into a room (or yard) that's pleasant and well-organized? Not directly related to the current 4 strengths, yet it can improve all of them, one way or another. If, in some metaphysical way, we are all connected to our environment, then improving our surroundings is part of what might make us SuperBetter, no? A new strength and/or powerpack might be appropriate.

Thanks for coming up with such a kick-ass game--so simple, yet so effective! Your karma points must be maxing out! ;-)