1

On command-line mode, Delete key erases next character, but if cursor is at end of line, it acts as Backspace, erasing previous character. Can I disabled that?

2

Try this:

:cnoremap <expr> <del> strlen(getcmdline()) == getcmdpos() - 1 ? '' : "\<del>"

This binds the delete key on the :-command line to running an expression and executing the keystrokes the expression returns. In this case I'm using a ternary operator to return nothing if the length is the same as the cursor position, and returning the delete key otherwise.

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