[…] "warp mode" that would allow me to press the up arrow and jump immediately to the bottom of the list. Is there a way to do that?
It is true, it seems there isn't a way to do that. On the other hand, I never really needed that (until now 
). Probably because after the first times when I manually selected the item, LB learned. But of course, in the specific case of generally wanting to go to the bottom of a given list, this is of no help.
I noticed that when you select a file and press COMMAND + arrow key (up or down), LB applies a color to the file and displays a number on the right.
With the Cmd (or Shift) key you can make multiple selections (like in the Finder, or any app that understands the macOS-like selection system). I.e., Shift for contiguous selections, Cmd to add single items to a selection.
You can then send the selected files to wherever you want, e.g. to an action to process them, or copy/move/sym/hardlink the selected files to a destination, etc.
after pressing the spacebar or right arrow to enter a folder, the color changes to orange?
Guess it just indicates that you are now inside the thing.
PS: Oh, and welcome to the forum 
Edit:
I just found out that you can use the fn-RighArrow (or End if you have an extended keyboard) to jump to the end of the list. Also Home (fn-Left) and PageUp/Down (fn-Up/Down) work.
Pretty obvious, unless you have only small keyboards, like me, and have almost forgotten about these fn-Arrow functions 
.