Some scopes have these, could we use them in close range with a toggle able key between the two sights?

In some bigger maps, it is great to have one of the longer range scope to counter some of those snipers, but when there is nothing else to do than going to the capture point, the scope makes things awkward.

It would be great if we could use these Backup / Close range sights for clearing rooms, holding the objective and any other close range combat that may occur during the game. They are already there, why not use them?