extension fingerings, key sigs

[Matthew Pierce]

I am writing a scale page for my cello students. Since each line is a new scale, each line has a new key signature.

Two basic questions:

How do I keep the new key signature from also appearing at the end of the previous line?

Also, how can I write { 1 x 2 4 } in the fingering font, adding an "x" between the notes to signify the extension between "1" and "2"?

I am using version 22.2.2.

Thank you all,
Matt