The problem some posters have with your thread is you are dealing with a very polarizing topic. There are strong proponents for camping and proponents for pure rushing. What you propose with "non-camping" modes can be easily circumvented. Corner campers will just become players that protect a small portion of the map. In a sense, that is still camping and you will still have similar issues as before.
Playing smart in this game has some element of camping in it. Do you think its possible to get a high killstreak or a KEM without camping at some point during the streak? Just posing a simple question, because so far, in my experience, it is not possible unless you camp at some point.