I think you're chasing a chimera. And, I fundamentally disagree with trying to exclude others from using bike paths/bikeways/MUPs as they see fit just to make life more convenient for cyclists.
- Autos, at times, have to share the road with trucks, motorcycles, cyclists, pedestrians, trains, (trolleys/streetcars/RR crossings), buses, other autos, etc.
- Cyclists, at times, have to share MUPs/bike ways with pedestrians, skaters, pedestrians, kids with training wheels, dog walkers, other cyclists, etc.
It is ironic when cyclists insist on their right to ride on the road (at times inconveniencing drivers), and then don't want to share bikeways/MUPs/etc. with other users (because of the inconvenience it causes them, at times).
You can probably cycle as fast as you want on the road, with the effect that you may cause drivers to have to slow down around you, and at the risk of getting hit by a car.
You can cycle on a bikeway/MUP/etc., with the effect that you'll have to slow down around pedestrians and other users, at reduced risk of getting hit by a car and at enhanced risk that you'll hit a pedestrian.
Surprise!! Other people exist, and they are as real as you are, with goals and desires that may conflict with yours.