Your comments

Should it apply to the whole file or just for new characters?

Right now, we enhanced the interactive rebase to highlight equal named commits, and provide options to squash them.

What is still missing when using Ctrl+P and Ctrl+Shift+P?

In version 19.1 one can show/hide merged commits if "Follow only first parent" is selected.

If you need more worktree commands than in 18.2 available, please request them separately.

Who would volunteer to co-operate with us on a long-term base to maintain the language of their choice (except of German and English)?