I am kind of surprised no one has brought this up.
I am sure some of you have seen that video where some guy was able to hijack a ....what ever its called. He used Armor lock to pass over the kill barrier. This made me think, you can REACH places or do something that you wouldn't normally be able to do depending on what AA you have equipped.
I cant clear this jump - Sprint
I cant get up that high - Jetpack
I cant get on that ship with out falling - Armor lock
It might be a good idea to notate where AA's are and if there are areas that can be found while using them.
UPDATED: (a little clearer)
Armor Lock -
www.igameanswers.com/halo_reach/halo-reach-glitch-how-to-fly-a-seraph-no-mods.htmlTo do this you need AL...this can NOT be done unless you have AL..
Now think about other instances on where this same application can be used.
Armor lock allows the user to 'Sticky' them self to any surface, you can literally AL on top of a moving Banshee or any ship for that matter. This can allow us to travel into areas that wouldn't be normally accessible.
Jet packing -
I believe I showed this to Kenji..not sure who else. On New Alexandria ( I think ) where you first get the jet pack, there are several areas that you can access that without it you wouldn't normally. Places like the death hallway: named that because waling half way down kills you. After getting to the last section of the chapter there is a way to nearly head all the way back to where you first enter the hornets. Heading this way will allow you to meet a lone trooper.
Also using the jet pack allows us to REACH on of the switches during the Package which grantees access to the tribute room.
Sprinting -
It the default ability but with it you can run and jump further (if running). Without it you wouldn't be able to run down that BOB at the start of the first mission.
Hologram -
This would be useful to locate invisible walkways, invisible pitfalls and the like. I cant really think of a time I used it...
Bubble shield -
I cant see any use for this.
Cloaking -
I cant see any use for this.
Player Combos!
jet packing stacking. REACH no heights by standing on a player with a jet pack to further your REACH, Jump, jet jump jet, jump jet.....
Now mapping out where and when AA's are accessible might clue us in on if there is a Secret/ switch/ glitch/ exploit.