I dont like it. Then noone would capture the flag, because the enemy could get to your base much faster than you could. IMO, the solution seems to be to add support for more weapons somehow, and one of those would be a grapple gun. that way you would either use grapple or a wep, not both. Support for additional weapons would have the added benefit of being able to have more weapons such as a superweapon?
Apparently tho, this is harder than it sounds.
I guess in some maps, especially close quarters, such a solution would work better than others, such as facing worlds.