Minor dissenting voice here: Can you do a 5 gallon batch in a 6 gallon turkey pot? Not without topping off after the boil.
In a 60 minute boil, you're going to boil off a gallon, give or take a quart, so you need to start with 6 gallons or so to finish up with 5. Plus, wort expands a little bit (about 4%) at boiling temperatures. So you're guaranteeing yourself boil-overs. Now, you could boil 4.5 to 5 gallons or so, which would leave you sufficient head space to avoid boil overs, and top off after the boil. That'd work, and leave very minimal impact to things like hop utilization.
As far as that timer, it's very easy to take that right out of the picture. Open up the box (remove a couple screws), disconnect the 2 wires connecting to the timer, then attach them directly to eachother. No more timer, done!