Map Idea!!

So here's what I thought today I know that in some locations in the summoners rift there are downhills and uphills, so the idea is what if when u cross downhills you got like +10 speed or when u cross uphills u got -10?? Wouldn't be that fun?? I mean imagine u have to actually choose wich paths would be better. Sorry for the broken English and for the long writing xD ty for reading.