Ford F-150 PATS keys question......

You definitely need 2 programmed keys.
I have not heard/read anywhere about how to program new keys, if you only have one.

Here's the procedure I know about.
PROCEDURE:
1) good key - insert - turn to "on" for 1 second ("on", not "start") - remove
2) second good key - insert - turn to "on" for 1 second - remove
3) new key - insert - turn to start car
4) done.

Can you fake it out by using the first key twice.
Real good question, but I doubt it would work.
According to everything I've seen, if you only have one key,
only the Dealer or a Locksmith (with the proper code reader) will be able to program the key.

I'd try out your theory, but my wife would me if I screwed up her Escape keys.

I do know folks have bought the PATS keys from Ebay for substantially less than the dealer.
Pardon the Escape forums, but heh, you should be able to garner the pertinent information.
(Sorted from oldest to newest)
Replacement Keys, do they have to come from Mazda/Ford?
cost of programming a spare key ?
Programmed keys
Help REPROGRAM Escape Keys?
Escape Keys - a Must Read !!!
Keys and beepers from Ebay