Manually force max speed for segment of a trip plan

[Brian D]

Description:  Ability to force a max speed for a segment of a trip plan. This is similar to what the planner does automatically to ensure you reach the next destination if charging is unavailable; however, this would be manual.

It would be preferable to set the speed in the units; however, probably much more consistent with the UI if this was done in percentage. Either would be fine.

Use Case: It would allow users to set a plan that better mirrors real world driving situations. An overall reduced speed does not allow this. For example - it may be impractical to do 80% of the posted speed limit on a slower road but this might be preferable on a faster road. The route planner does not allow for differentiation. It's all or nothing.