So I tried to figure some more things out, and I think I have it figured out for the most part. So from what I tried with the method to see keypresses (see below), I get one type of ctap when I jump before I press -duck and another when I jump after. In other words, I was crouch jumping, and my ctaps are so shitty that I couldn't tell half the time. Jumping after uncrouch results in height values 20 units below when you would jump before the uncrouch. 20 units is the distance your feet (origin) come up when you crouch in the air, and I am 100% sure I haven't been holding crouch in the air.
In other words,
crouch jumps have an entirely different set of bounce heights than anything else.
I also wanted to test if the model clipped in the ground briefly during one and not the other, but I had a pretty difficult time because it didn't me issuing the wait command even though I had it enabled, and would give me varying results. For the jump before uncrouch set, I identified a possible place that would be 20 units below the ground that could be the start of the jump but I really have no idea - I was just trying stuff out.
Spreadsheet:
https://docs.google.com/spreadsheets/d/1mD6jceuKZV3jk9sPfeVces20yY3EB64Ox8gGFeFA9nY/pubhtmlThread:
http://teamfortress.tv/thread/5590/repost-see-player-keypresses-when-watching-a-demEdit: After a night of experimenting with Rob, we determined that crouchjump crouched has the same values as ctap uncrouched, and crouchjump uncrouched has the same values as ctap crouched. Rob will be putting this on tempus bcheck even though they are the same values as ctaps just switched between crouched and uncrouched.