You can find the menu for manually creating Remedy tickets from TSOM event GUI under 'Remote Actions'. However If no one in your environment ever used it before, there is a possibility that it may not be fully set up as I remember sometimes I had to make some changes in the underline code during the set-up.
Hope it helps,
Thank you Willa!
The RA is there, but not working; just as you thought.
Now I need to look into it.
Have a great day!