Thank you everyone for your very helpful responses.

I'm aware that I really should spend the time to read through the documentation properly so that I can better understand how to get the best from BIAB, but I'm sure that we must all experience those rare magical days when we're inspired to create a song and just want to get to work before we're distracted by something or someone, or have a limited amount of spare time available in which to capture it ?

That's where this forum and the users who contribute to it, are a great help.
And yes, there are occasions when I might like to start with a 'beefed up' rhythm for the whole song, and then make adjustments to the arrangement at a later stage.

https://linktr.ee/andyshearer