In addition to the screen flag: Sideview Gravity, there should be a new combo type. This combo uses the same effect as slow walk but for compatiblilty with sideview gravity as long there is no red marks for solidity.
Only Link can climb this combo up or down (gravity defying).
The catch: Enemies cannot climb this and when they walk to the spot where the ladder is below, they fall.
I highly suggest this new combo type.