[CW] Morse code for ! and #

[Ken Brown]

>And of course the code gives the ability to produce upper and lower
>case so you could shout in morse if necessary ;-).

Is there already a Morse character to indicate shift? If so what is it?
If not, what would you propose?
Would there be a single character for shift, that would apply only to one following character,
or would there be a shift and un-shift sort of like LTRS and FIGS on a TTY machine?

Seems like the only combinations of dits and dahs that are not already defined are pretty long.

DE N6KB