Register after checkout
Sana v9.2.0 adds the possibility to check out as a guest. It would be nice if the guest checkout would offer the possibility to register for an account after the order has been submitted. The user should then only be required to supply the information that wasn't already supplied to place the order (e.g. a password). This could also simplify the checkout by reducing the number of options when the user isn't signed in at the time of checkout: sign in to an existing account or continue as guest with the option to register.
It could be interesting to have a look at the custom single page checkout proposed in the Cameloso project.