I should be able to help answer some of these questions!
Currently, the only thing we do have is just the "Insert Bible option". We do have plans to add what you're mentioning as far as changing them on the fly, but at the moment the only thing we have is that Insert option...
As far as the Dual Bible option yes, you can rearrange if you'd like it to be vertical or horizontal. Directly below the "select chapter" drop down, you can select it to be "Dual Bible" directly beneath that you'll see where it says "Dual Orientation" and can choose which you'd like from there. To change that after inserting it, you could either use some of the position formatting directly above the editor for each individual bible, or just go back to the insert option as well.
To answer your final question, Templates are what you're looking for to do everything all at once, but they aren't quite available yet, no. That is also on the list to add and should be available soon!
I hope this helps! God bless.