I'm just venturing into mobile use of the Logos app and I'm in the process of deciding whether to go with an iPad, a standard Android device, or the Kindle Fire HDX.
I make quite a few notes while reading, and one frustration I'm having with the iPad Air I'm trying out, is that I don't see any way to use the split keyboard in a docked mode. I'd have no problem with that, except when it un-docks from the bottom of the screen, it moves up and covers a good portion of the text entry window so I can't see what I'm typing. Now that's really helpful! 
I went through the iPad settings and didn't see any way to keep the keyboard docked when in split mode, nor am I'm able to drag the keyboard sections off of the text entry window.
I then installed an alternate keyboard from the app store, but don't see any way to select it for use from within the Logos app.
Is there any way to use the iPad's split keyboard without it covering up the text box window???