Nice, I think that will help. I see myself binding those possibly to my additional mouse buttons on the side if possible (though I will test effectiveness of default mapping too).
But… Doesn’t the whole speed thing currently rely on target speeds? They’d have to rework the entire flight model and we’d have a very different-feeling game. With such great speeds involved, the only way to travel is choose your speed and wait for the ship to catch up!
At least we have a choice of a gradient (via mouse wheel) and incremental set speeds. The latter can simply act as a ballpark setting which is then fine tuned. Speaking as someone who’s mouse wheel is not very good, I rely on the increments quite a lot.