Props to the OP for trying to play with mouse and keys, must be worse than ArcElite... would much prefer to use mouse and keys myself but only with pitch and yaw, not roll...
While somewhat off topic, I found that the default mapping scheme in ED is a bit weird.
By default the mouse controls pitch and yaw, which is sort of understandable, as it's most "natural" when you consider FPS games. However I found it very tiresome given EDs mechanics.
In ED ships roll really fast, pitch is second in speed (depends on blue zone, but still), while yaw is the slowest. Also, a keyboard is a "digital" input, meaning you can't fine-tune your key press - it's always pressed "fully".
What this means is that with the default setup the pitch works well, but roll is somewhat uncontrollable (you always roll at max speed, which makes it difficult to fine-tune) and yaw is even slower than before (slight delay before you go to max yaw in either direction when using the mouse).
Therefore I swapped the yaw and roll around - yaw is now on the keyboard while roll is on the mouse (pitch remains unchanged). I can therefore perform rather precise rolls (and utilize faster pitch) with the mouse, while yaw is slow enough that it can be precisely controlled with the keyboard.
I've then refined it and added the fallback to mouse horizontal movements - usually you don't need to roll constantly in one direction (landings excluded). At the same time you can pitch for long periods of time when doing the circling dance during combat, so mouse vertical has no fallback.
Obviously a proper HOTAS would be better (especially with the added throttle control)...
Which brings me to this question... are there any people out there who are using FA-OFF for prolonged periods of time and using a keyboard + mouse control scheme? If so, how do you do it? Assuming I don't fly something bigger like the Conda (which is slow enough to be easy to control), I can juuuust about to keep my eyes on a target (and that's still with a lot of sway)... and that's EXCLUDING trajectory management. If I try to also keep my attention on trajectory then it all goes to hell pretty fast.
Another question regarding keyboard + mouse is... where do you have your energy management keys? By default they are on the arrow keys. If I keep my left hand on the throttle / roll keys, my right on the mouse, then managing pips is quite the task (not impossible, but annoying to say the least). I wonder if there's a better way to map keys so that pip management isn't such a hassle.