Oops, I replied to the wrong post initially, where someone was requesting that another plane fly out to where you've landed and refuel you.
On the topic of instant resupply- it's incredibly gamey. At the very least, it should take, IMO, 30 seconds (as it is on the rearm pads), or longer.
This particular suggestion is meant only to allow people to rack up higher stats per sortie. They can already exit and replane with the desired loadout in the matter of a few seconds, so I don't see what this would add in terms of gameplay.