One way to achieve this would be to simply change the structure of Earth's magnetic field. At the moment, the field is that of a large magnetic dipole, with the field produced by the motion of fluid within the core. Maxwell's equations (see Chapter 4 of these notessee Chapter 4 of these notes) tell us that this motion should produce a magnetic field with radial component $$B(r,\theta)=B(r_{\text{core}})\left(\frac{r}{r_{\text{core}}}\right)^{-3}\cos\theta$$ Here, $B(r_{\text{core}})$ depends on the material properties of the outer core (density $\rho$, electrical conductivity $\sigma$) and the rotation rate of the Earth, $\Omega$: $$B(r_{\text{core}})\sim\sqrt{\frac{\rho\Omega}{\sigma}}$$ Unfortunately, we can't change the angular dependence of this expression, just the amplitude.
Earlier, I mentioned changing the structure of the field. We could do this by adding in some higher-order terms, creating, for instance, a quadrupole field. In the quadrupole case (with vanishing dipole term), there are actually four magnetic poles, not just two. This would presumably lead to auroras in many more places around the globe.
Here's what a quadrupole field would look like:
Image courtesy of Wikipedia user Andre.holzner, CC BY-SA 3.0.
Whether you could create a physical process to generate such a field is another question. We see that $B\propto\sqrt{\Omega}$ because it's the Earth's rotation that drives the motion of the fluids that leads to the dipolar field. It seems unlikely to be that the same mechanism could generate a quadrupole field. Perhaps there are multiple cores in the planet, still in the process of merging? This would involve a complex system of moving material, which would lead to higher-order moments in the field's multipole expansion, and perhaps the effects you're looking for.