I'm no PnP rules buff, but there might be some feat or ability that could translate into an enhancement for this:
I would like a pink pony. My pink pony would be the ability to use a higher level spell slot to load a lower level spell. The character I notice this the most for is my ranger. First level spells I would like to have loaded: jump, resist energy, ram's might, tumble, longstrider. Level 1 spell slots: 2. Level three spells I would like to have loaded: <crickets>. Level 3 spell slots: 2.
That's my pink pony. For today.