I'm pretty sure it's supported, whether intentional or not... on 1.1.8 it's right in the tab completion, with help and all:
Nov 7 2018
Jan 5 2018
I like the way it works now, but honestly as long as I can get to both the CLI and the OS shell somehow (with a command), I don't really care which is the default.
Aug 13 2016
I'm still interested in this, and still planning my upgrade project. If anyone has suggestions, or advice for how to get started on a PR for this, I'd greatly appreciate it.
Jun 9 2016
For my own or anyone else's reference: