Good point. It seems too many people today are in a hurry to advance to that second plane. Then they end up crashing it within a month (or less) because they weren't really ready.
Your trainer is capable of a lot more than you might think. I'll usually show my students that their trainer CAN fly inverted circuits, and split S's, and cuban 8's, and with sufficient power, outside loops. And that's with a stock trainer. Increasing the throws and reducing the dihedral makes them even more aerobatic.
Don't be afraid to fly the wings off the trainer before moving on.

Dennis-