Been thinking about this and I can only think of one possible problem for flat towing. The parts that don't factor:
On my 2012, there is no steering lock so it would be able to track on a tow bar while "off". When placed in park, the drivetrain is arrested by a "parking pawl" that engages in the transmission. The brakes don't appear to apply unless you pull the handbrake.
You can validate this yourself by parking on level ground and pushing the car forward and back - the wheels will turn slightly, turn the halfshafts, which will be stopped by the pawl *after* the motor and transmission have stopped against their mounts.
When the brakes are engaged - with the pedal if it's on or with the handbrake, the wheels will not shift and all the slop is the drivetrain never factors in. If putting the transmission in park applied the brakes, we'd expect to see the same behavior in both cases.
Speaking of the transmission - it contains zero hydraulics as best I can tell. Components are not moved with fluid pressure, there are no clutches. There's nothing that would rely on the motor being "on" like you see for ICE vehicles. The motor shaft, differential and driveshafts are always connected and moving in concert. There isn't a separate reverse gear, they just energize the motor windings in the opposite order.
There is lubrication happening in the transmission but every component that moves while being driven is moving when the car is coasting in neutral - which is accomplished by "switching off" the regen. If the motor coils are open circuit, no current can flow, so no opposing magnetic field is generated, so nothing "drags" on the motor shaft.
So when in neutral and off we have the steering free, the brakes disengaged and the transmission freewheeling and lubricating itself like normal. Seems totally workable to me. About the only other thing if try to do is physically block the parking pawl arm to prevent any possibility of it engaging.
Here's the biggest obstacle I see, you setup a tow bar and hook up the car... Great, you have a fairly heavy vehicle that requires remote brake control to be legally towed in several states. How do we do that on this car? If an ICE vehicle can have remote braking while not running, you'd think it would be the same for the Focus EV. And I'm pretty sure that aside from the boost vacuum coming from a pump instead of the engine intake, the rest of the braking system is the same.
So, assuming you can get a proper tow bar and remote braking system, you should be able to dingy tow a Focus electric while in neutral and turned off. Handbrake off, parking pawl pinned back if you're paranoid.
What do you all think?