I have just shifted from the stable builds deb channel to the dev builds dev channel and now see that with build 2006, the toggle_location_bar
command does do work via key bindings (it does work in the most recent stable build 1119).
Here is the relevant line of my “Default (Linux).sublime-keymap”.
{ "keys": ["ctrl+k", "ctrl+b"], "command": "toggle_location_bar" },