Prereg form should allow for A/B testing
We occasionally debate whether to include any of the optional form fields on our prereg form. There's been a lot of research to suggest that adding more form fields decreases conversion percentages, but we like having that extra data.
So it would be nice to have multiple versions of the prereg form both with and without the extra fields. I've heard really good things about https://www.optimizely.com/ for making this happen.