A few things about Nutcracker.
First, Nutcracker does generate Vix and Vir files for Vixen and does so well, HOWEVER, these files are ordered by Nutcracker with the pixel order in which you set your target models.
Second, Nutcracker does not (yet) have a utility for setting the start address of a 'project' (our vernacular for a sequence). We hope to provide this in the next major release of NC after the holidays.
Third, Nutcracker does not account for multiple elements in the sequence (yet). In other words, right now you can sequence a single element like a mega-tree, all of your single-strand effects, your rgb matrix, etc., but you have to do this individually within the application. This isn't a major limitation (IMO) and we are looking to allow for something we are calling a MEGA-project in the future (where you sequence ALL of your elements within the megaproject).
One thing we are NOT trying to be in Nutcracker is a replacement for the sequencers (we always say we are not in the sequencing business -- just an enhancement to the existing ones!)
Kurt