Good keybindings, some are missing compared to what normally works, e.g., in the browser text input area or in gnome-text-editor (Ctrl-Shift-Up/Down was one I directly ran into).
I've found https://github.com/gphalkes/tilde to work quite well, it also supports the system clipboard. Nice to see a Rust alternative.
ctrl+shift+up/down - not sure what you mean it to do?
In VSCode it adds multiple cursors directly above/below.
In other editors I think it moves (shifts) the current line up or down.