Yes, yes, yes! I would love to be able to stockpile leves and have a faster Guardian's Aspect regen. You can only recover 30 every 36 hour period (I believe that's right; 10 every 12 hours) but potentially use up to 80 in that same time frame.

It doesn't even have to be a quicker regen. How about explore Guardians in game and what it takes to curry favor towards your guardian? Make a donation or do a repeatable quest or two and increase your standing with your Guardian. The more you do, the better your reward gets over time. Like building up reputation for your Guardian.