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Windows 11
V. 3.1
I can save a 6 second preset for silence on one end of the wave but I can’t seem to save it for both ends at the same time.

I think you need to make a macro for that … https://manual.audacityteam.org/man/macros.html#manage

https://forum.audacityteam.org/t/macro-equivalent-fro-insert-silence/51050/14

If the track isn’t too long, you can add 6 seconds to the start and end using this code in the Nyquist Prompt effect (https://manual.audacityteam.org/man/nyquist_prompt.html):

(defun add-space (sig current added)
  (abs-env
    (sim (s-rest (+ current (* 2 added)))
         (at added (cue sig)))))


(multichan-expand #'add-space *track* (get-duration 1) 6.0)