[nXqd]

Honestly, if you already use powerline or familiar extension, you can look at the status bar for the absolute line. I find it's no need for changing between modes.

And if you use Mac OSX and latest vim version installed by homebrew, in relative line number mode of vim, instead of 0 it is the row line number.

[johncoltrane]

You know you don't need Powerline to display information like line number in your statusline, right?