A large undertaking, but switching from the concept of having a shared global set of fields, to having a set of fields per form.
Freeform would include a separate area for that allows you to create A/B Testing groups. You simply create a new group name and select which forms you want to be a part of it. You can then weigh wh...
Ability to have all Mailing List and other CRM integrations check and update existing contacts, where possible.
Update / include a variation/setting for "Live checking" of input fields to validate them when users correct their errors with the built-in AJAX feature.