It's intentional to limit these to $regular_speed - 5km/h, same as with mopeds. I assume it's so you are converted to a real vehicle (car) by virtue of being assaulted on the roads by those driving them?

I certainly don't agree with 35km/h on bike paths. The current 25km/h is plenty and given their popularity with older ages, already producing outsized numbers of injuries and deaths.