I don’t know if this has been thought of yet, so I am going to share this idea.
Basically, we should have the ability to make folders for our files. Like on a computer. You create a new folder, to put files in there, to order things.
Real life scenario:
Ok, I want to put some racetracks on for my friends. Oh no! It appears I have hundreds of maps and I simply cannot uncover any of my racetracks, due to the overwhelming number of maps listed.
How it works: (following on from scenario)
Select ‘Create new folder’, name it ‘Racetracks’. From then on, all racetracks made or downloaded can be saved directly into the ‘Racetracks’ folder.
New real life scenario:
Ok, I want to put some racetracks on for my friends. Oh good! Luckily 343i allowed us to have a folder for specific files! I’ll just go on and select my ‘Racetracks’ folder and put on one of my racetracks. 
Now, to clarify, the folder doesn’t have to be specific to game types. Anything could go into the folder.
Also, it should be applied to films, screenshots and gametypes.
Film scenario:
I’m making a montage! Oh no! I have a bunch of clips, and now I can’t remember which ones are supposed to be in the montage.
How to fix it:
Make a new folder, name it ‘Montage’. Save all of the clips that you get for your montage in there.
Simple, yet very important.
Give me a thank and vote in the polls if you agree 