In addition to suspend, halt, etc., it'd be nice to prevent/trigger locking the current session (via screenlockers for X or tlock for the TTY). The lid switch would be much better as 'lock' than 'ignored' here ('suspend' is a silly behavior IMO).

Probably needs things such as:

  - Changes to screen lockers (tlock/xautolock is what I care about, but DE-level WMs would probably like this as well)
  - Video players to inhibit the locking (systemd-inhibit is fine as a partial solution in the interim)

I imagine the simplest thing would be to create a client which has options which are commands to run for "lock" (this should work for both xautolock at least; probably DBus-enabled stuff as well; I don't know how well tlock works if it is run while something like vim or rtorrent is running though what tmux does for setting up lock-command seems to work fine).