I've been using Storyist for a while now and it seems to me that the program wasn't really meant for publishing e-Pubs, or really publishing at all. I think Storyist is really meant (and geared to) novelists and scriptwriters that want to write a manuscript in the appropriate standard submission format that can be submitted to an agent or publisher to be published. I do think it's awesome that a program like InDesign is there for those that want to really spiff up their publication. I know Scrivener (another program I use) has a template for e-Pubs, but it looks very "meh." I just thought I'd throw in my two cents. Anyway, have fun creating!