I wouldn't worry about it. Someone at Tesla has probably already figured it all out.
As for the inside of the car, the types of switches used to unlock or lock the door seem to be the same style as those used for the window switches. Though not labeled as such, I'd expect that for the window switches a quick tap or pull would be equivalent to an express open or express close function. Thus, for the driver's side door, the lock switch probably has a third & fourth action that would be equivalent to lock all doors and unlock all doors.
In terms of the approach to the car, chances are you will be able to set that to whatever you prefer to happen as a default setting. The car will simply do what you have told it to do. So, nothing, unlock driver side door, unlock all doors. Maybe there will be proximity sensors, so that if you stand next to the car for a certain amount of time, the other doors will open automatically -- same thing with the trunk or frunk if you stand at the back or front of the car a few seconds. Or maybe, just being in possession of the phone, while close to the car, will unlock the door handle you pull on simply because you are there, while leaving the others locked.
And in terms of a wireless signal, I doubt that will be a problem either. The phone would use Bluetooth, not the cellular signal, to connect to the car and announce your presence. Beyond that, perhaps you should find a Wife with larger hands, or with a higher level score for Dexterity in D&D?
But then, I tend to not worry about
'security' all that much anyway. Sure, my head is on a swivel when in public places, but there is never anyone there to be concerned about. It helps that I am apparently a rather imposing figure -- so no one messes with me at all -- at least not without backup running three-to-five deep. Strange thing -- people only like messing with someone if they think they can get away with it -- no one wants to get their butt handed to them while trying to have
'a little bit of fun'. But generally speaking, I am the single most lethal individual on the premises anywhere I go.