That entire partitioning screen could use a redo.  It doesn't even support the default of LVM, let alone encryption, let alone encryption options.  I don't know when I'll find the time for this but it needs to be done.

I do not have time for this now, or in the forseeable future.  As I previously mentioned, I'd really prefer to redo the whole screen rather than figure out how to add more stuff in that will also eventually need reworking.  I will, however, consider patches.