Game Cache or Blow

The question all comes down to this; is there a limit as to how much can be shoved (stored) within a game cache?

I did a few tests and got over 10,000 entries without errors, but you never know.

Reason I ask is that I'm thinking of using the game cache to store the majority of variables within my campaign. For example, when I create a quest it stores all the info within arrays which then need to be re-created on each map load. If I used a game cache, I could create all the data at the beginning, and then just call it from the game cache within any map when needed. This could lower my maps loading times drastically, since nothing has to be set during the load, as well as transferring the data between maps.

Ideas?

Edit: One more thing: Is there a way to copy mission keys or even caches? This would be awesome and make my life easier.