In addition to /carpet creativeflyspeed:
Adding a separate argument or command for flight speed while sprinting
Also an command to turn off landing when your feet touch a block

I have another feature that comes with this issue.
I am using worldedit mod and have problems aligning player properly to copy/paste. It is hard to move when inertia pushes me 0.5 block on a little hit of a key. I would like to be able to align myself to the center of the block easily.

I would also like to speed up creative flight sprinting