Secondary Keybind?

[iDclip]

It is impossible to fly a plane properly with mouse without a secondary keybind. I need a key to get maximum pitch to turn properly, with mouse it is either too slow or with high pitch sensitivity too hard to aim properly at a slow moving object.
(that was perfect in bf2, you had both)

Currently, i have to decide between dogfight and tank killer configuration, but i'd like to be able to do both. Is there any method to bind a key to pitch backward, without losing the mouse steering?