Is your rig manual or auto. I'm guessing manual as you are interested in the pedal response settings. I found out later on that it doesn't really help on the autos.
It's tricky to find. Here is a copy of my post on another forum.
It is very hard to find the update unless you dig for it.
Pick a tune to install on your vehicle even if it is the same one as before.
Once you select that tune, look at the submenu under that tune. Should be options or advanced options, then pedal response should be available. I updated the tuner twice and spent awhile before I figured out where it was. It's actually another layer deeper than the OP mentioned.
Can't help you with the lockers question as I don't have em. I do know from reading that to use the lockers in 4HI the tuner has to be plugged into the OBD port.
Someplace there is a list of all of the data logging options but I can't find it. You can plug it in and scroll through everything, I've glanced through mine and there are a bunch of choices.
Superchips also has a forum on their site that might help.
Lastly, sometimes it takes a couple of updates over the internet for features to be installed, so if you don't find it update the tuner again.