The best part of all this is that you had the case with you anyway so no extra kit is required. Even if shooting groups is not your thing, just having a model rest one foot on a case can dramatically change the shape of someone's body and transform a rather flat footed portrait into something more dynamic. A hard case can be used as a make shift apple box to help balance up the size of everyone. Another handy use for this is if you are shooting groups of people and they are of varying sizes.
Just raising the model several inches off the ground can turn a rather played out location into something a little different. It is especially useful when shooting at locations which have been used many times before. I have used the case as a platform for models to stand on quite often.
In the same vein as the last point, there are occasions when you want your subject to be a little taller. It also makes an excellent seat which you will really appreciate when you have to shoot at a low angle for any length of time. Even though you will only gain a few extra inches in height you'd be surprised how many times you'll find it comes in handy. Thankfully the Peli case is so strong it won't have any problem with you standing on it. There are times when you just need to get a little higher on a shoot and if you're in the middle of a location then maybe a pair of steps are nowhere near. Just make sure you take out the gear you'll need before you hit record. I can see this being useful for when you want to set up a time-lapse camera for a BTS shoot. If yours doesn't have this you can still attach a light to one of the two handles with the help of something like a super-clamp or Gorillapod. Obviously this was not what this hole was ever intended to be used for so use with caution, but as you can see in my picture the case has instantly become a very sturdy low-level light stand. This opens up a world of possibilities as virtually every camera accessory can now be attached to your case with the aid of various grip.
If you carefully remove the valve by unscrewing it you can actually put a spigot in its place. I recently discovered that in some of the older hard cases I own the purge valve (which lives just above the handle and regulates pressure) is held in place by a threaded opening.