Going to try and keep this quick and simple…
I believe the secondary objective on bridge (the barricade) should be classed as a primary objective and defaulted to activated. I understand there is the issue then of not technically being able to cycle the objective (reactivate it multiple times) however I feel in Stopwatch this could be more of a pro then a con. However, personally I feel when the EV breaks the half way point is when the objective should be considered complete and not when the barricade is blown. I would default the barricade to activated and still allow it to by cycled.
The reasons for this are simple.
In stopwatch mode it means if a team manages to do what is possibly the hardest section of the map and the other team does not the team that did will get the win.
It would default to activated that limits the ability to instantly rotate and block the construction. Even if the attacking team get to plant immediately it still gives the defending team the additional 50 seconds to fight back.
In objective mode you get to share the time out better between the objectives meaning no more 12 min stuck on that one objective.

