So far, I’ve found the “INVISIBLE” cleff (which you can invoke from the clefs popover) very useful. I have so far used it for various purposes, such as designing blank exercises to be filled and blank templates for a similar purpose.
I am however missing another “INVISIBLE” item, which would be an “INVISIBLE BARLINE”. This could be accessible through the bars popover as is the same case with clefs. This would be extremely useful, as it would allow users who compose/engrave using no time signatures to have greater and easier control over their layout at engrave mode. Dorico handles stuff between barlines very well (especially in engrave mode since it resizes stuff in between; working with no barlines is a bit of a hassle), so let us who don’t work with barlines get the juice out of it!
P.D.: Another little suggestion: Please, add some default margin sizes, like sibelius (medium, large, small, etc.)