Hands-down the biggest issue I run into with Logos (especially when telling others) is that it's extremely complicated for a beginner to use. People want the robustness and library of Logos but with the simplicity of BibleGateway or OpenBible.
Would love to see an overall app mode that turns off ALL the bells and whistles, and pares down the amount of choices involved with using Logos. For instance, even in something as simple as highlighting text, most people default to 3-5 highlight types. Having dozens to start with is overwhelming. Would love to have only a few available for beginners who can then turn on the remainder if that's important to them. That's just a simple example. The same could be said for having multiple view choices on every single screen, etc.
Would also be nice if it could eliminate the features that take you away from the view you're in. It completely freaks people out when they're using a book, hit a button and suddenly don't know why what they were using went away (it's really just hidden under a new window.
Anyway, I think a simple mode would go a long way toward allowing us to share this app with others who aren't tech savvy (most people I know!). :)