Airplanes with dihedral usually come back to level on their own. It depends on the airplane. G4 simulates reality, or tries to.

I just saw your post and went off into G4 to see if it was failing to do that. The highwing trainer I tried came back to level about as fast on G4 as it does at the field.

I've got a P40 I'll be flying in about 2 hours. It's got dihedral and really doesn't right itself very quickly in real life. The G4 one is about the same.

It'll depend on what airplane you're flying in G4 and how well they've modeled it. The couple I just tested on G4 seemed realistic.