Laptop Lid Close -- Customize Locker

So a few months ago I loaded up Ubuntu onto my laptop to give it a whirl but found myself somewhat limited by Unity (especially in terms of performance for a 4GB RAM machine.) I switched over to my all-time fave, Openbox, and started setting everything up; I kept lightdm, I started using xfce4-power-manager, tint2, et. al. I've gotten everything relatively set up the way I want it but I can't seem to customize what happens when I close the lid of my laptop. I have tried writing custom scripts for acpid and systemd to be told that Ubuntu uses Upstart. I have yet to write a script for that as I'm hoping there's an even simpler way via, say, xfce4-power-manager.

tl;dr:
General question: How can I customize my lid closing action in a simple and persistent way?

Specific question: Does xfce4-power-manager allow changing the specified locker (I'm hoping to use dm-tool lock) when the option "lock screen when lid is closed" option is selected?

Thanks in advance!

Originally Posted by imarriedyoung found myself somewhat limited by Unity (especially in terms of performance for a 4GB RAM machine.) tl;dr: General question: How can I customize my lid closing action in a simple and persistent way? Specific question: Does xfce4-power-manager allow changing the specified locker (I'm hoping to use dm-tool lock) when the option "lock screen when lid is closed" option is selected? Thanks in advance!

I use Gnome-session-fallback in Ubuntu as I was used to the "old-style-ubuntu-with-two-panes". On my laptop I just wanted the system to shut down and power off when the lid is closed to avoid draining the battery... As Ubuntu did not have that setting available by default, I used the Gnome-Tweak-Tool to set the lid behaviour as well as the power button behaviour to get what I wanted. The actions to choose from in this tool are Blank, Hibernate, Interactive, Nothing, Shutdown and Suspend. I don't know if this will work in Openbox or how to script this...

Hmm, yeah, xfce4-power-manager was defaulting to gdm, but I wasn't too keen on using it. I wanted to try stick with lightdm for locking the screen when the lid closed.