Feature Request: Add shortcut for Alt+Arrow and quick select line support.

[KuRRe8]

I have fully migrated my simple editing work to EDIT.

I would like to know if adding the following features is reasonable:

1. Use alt+arrow up/down to move current line upward or downward.
2. Use alt+shift+up/down to copy upward or downward.
3. Single click on line number to select current line including line ending. (I know 3 click on a line content will have same effect.)
4. Click and drag through line numbers to select mutiple lines, this maybe a bit more convenient to select entire lines(include no spaces in next line) rather than clicking and draging in content area.