Smart Camera Lock

Simply question, can we have camera lock ( " y " ) like one in spectating games? Which means, camera lock will not be that sharply locked to champion, instead of that it will flow through map, following objects of interest, like enemy champion on my line, at the same time as me (Like we position it, me at the one end, enemy at the other, but auto). It would be awesome if camera could adjust for every champion that come where i am. Or just make it like it is in spectating games. (It just came in my mind that even with Smart camera lock, it could allow us to adjust it a little with standard technique, mouse pointer to the edge of screen.)

If that's too hard, or cant  be done, can we at least have Left mouse button drag camera, like middle mouse. I think there should be option for that for whoever would like it, like now i can make it like Shift+leftmouse but that's too much buttons and really hard to catch on. I'm using guickcast and my left button is pretty much unused. 

I'm sorry if this is already been asked before somewhere and i'll be happy if you redirect me there.

Ether one of suggestions would greatly help me and other players who find it difficult to push camera view on the edges in the middle of the fight and getting mouse pointer back constantly.