Another possibility is that your windshield is leaking and water got onto the pedal assembly and rusted it. It happened to me. I took the pedal assembly out and cleaned and greased it. Problem solved. Not saying that is your issue but it is possible.
Sounds like a bad master cylinder but check the pedal assembly first to make sure the rod the pedal swings on isn't rusted. I just had that issue. Disconnect the rod from the master and move the pedal back and forth to check for binding. While your under the dash look where the rod comes through...
There is a check ball in that "roll over" vent. You should have heard it rattle if you shook it. Replace it if you couldn't put air through it in either direction.
You will need two 4 pin relays for your install as the outputs on the remote entry is not rated for the amp draw that is required for the lock actuators.
There is probably a member on here who would help you out with their computer. If I were you I would make a thread about needing someone with a computer to give you a hand. I would do it but it would be 14 hours driving round trip for me.