although, it might be weird coming from me, who couldn't play black key etude...
this might not be the "conventional" way, but I find it a lot easier to tighten my fingers (like Horowitz, not as much as him though) on fingers that will play the black keys.
In La Campanella, I would generally hit the D# with the joint of my pinky, and the melody part with the joint of my thumb. IMO, hitting it at the joint would help a lot more in terms of stamina, and accuracy, because you have a lot of margin of error.
The con is that it's hard to legato out of it, but for a fast piece like op 10 5, it's fine (look up Horowitz Black key etude on youtube)
1) for the first 2 measures, it depends on what publisher you have, but I'd recommend this fingering: 241 424 152 314 241 424 152 314
some editions have 351, which makes the transition from the 1st measure to the 2nd harder, and the fourth finger is more accurate for me.
the pinky in the 152 part should push the hand rightwards, and then the second finger after that should play the note while stopping the rightwards motion created by the pinky. (hardest part to play smoothly for me, that's why I quit)
2) measures 3-4 , the octaves should be done with 14, then 15. (if you can reach the 14)
(142 415 142 415...)
what's important the 3-4, is when the thumb moves, (Db Db(octave up) Ab Db Ab(thumb)), the fourth finger playing the Db should push the whole hand right, along with the wrist's snapping, and again, use the joint of the thumb to play it, and you won't mess up.
doing this would rule out about half of this piece.
and La Campanella wouldn't help that much, only for leaps, but black key doesn't have challenging leaps so...
just my opinion, after all, I couldn't play this etude, but the fingers straight and hitting with joints would help significantly in playing this etude, and many other challenging pieces that have lots of fast black keys