I might be wrong here, but I think the system can't even measure, nor does really care whether you alternated or single tapped any given part, the difficulty comes from not being able to rate those very fast very small jumps higher, without overrating spaced streams like freedom dive or rungran - dmc etc.
- something like 1/2 of the radius of the actual hitcircles could be substracted from jumps so that spaced streams are not considered as big fast jumps technically (since you stay on circles almost alll the time)
- also, being able to measure the angle change required for going from one note to the next could help to determine how hard they actually are in the case of very small jumps (just a simple line of notes that can be streamed like Holy Orders, or jumps like the ones in Lesjuh's Talent Shredder, or something in between). On the contrary, small-medium jumps are harder to play in a line, than at sharp angles for me at least.
I know I don't know much about the technical difficulties, so probably what I'm saying isn't helpful, I'm just throwing out some ideas, in case it can be of some use.