robbo:

I use the Windows version so I'm not sure my comments will apply.
If you use "Ctrl+T" it hides many of the toolbars, if that's helpful.
Plus, there's even a way to customize what's left, to show only the icons you need.

Otherwise, I don't see how you could simplify it much more.
No matter how you use the program, you're going to have to:
- pick a style
- pick a key
- pick a tempo
- set the song length
- type in the chords

I only use BIAB on occasion, so I don't consider myself a "pro" at it.
But once you learn where the buttons are for those functions, it's
certainly not hard to type in the chords of a song.
I'm guessing there are plenty of users here that, even though they're fairly new,
could easily enter a song in under 30 minutes, and some in under 10.

What part of your process in BIAB is slowing you down?
Finding the right style?
Getting the right chords into the right "boxes"?
Let us know, and there's likely people here who can speed up your "process".

LLOYD S