evil-mc

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I'm wondering what is in the way of supporting for example simply inserting a backslash (the AUCTeX TeX-insert-backslash command). What does need to be done to add support for it?

You just need to add it to the known commands. See evil-mc-known-commands.el

  (nconc evil-mc-known-commands
         '(
           (TeX-insert-backslash . ((:default . evil-mc-execute-default-call-with-count)))
           (LaTeX-insert-left-brace . ((:default . evil-mc-execute-default-call-with-count)))
           (LaTeX-insert-right-brace . ((:default . evil-mc-execute-default-call-with-count)))
           (LaTeX-babel-insert-hyphen . ((:default . evil-mc-execute-default-call-with-count)))
           (TeX-insert-sub-or-superscript . ((:default . evil-mc-execute-default-call-with-count)))
           (TeX-insert-dollar . ((:default . evil-mc-execute-default-call-with-count)))
           ))

This is what I got so far, however inserting a dollar sign does not automatically insert the closing dollar sign for some reason. Also, the keys following the pass through command C-q are not recognized. I couldn't figure out which command is called because one cannot call describe-key in between as it seems. The other command work just fine.

If you want to see what command it's trying to execute just run evil-mc-executing-debug-on and you should see the debug statements in the Messages buffer when you try to run a command with the cursors enabled. But, the commands above are a good start. I'll add them in when I get a chance

When inserting a dollar sign with debug on I simply get these messages:

evil-mc Execute TeX-insert-dollar for all cursors
evil-mc Execute TeX-insert-dollar with evil-mc-execute-default-call-with-count [3 times]

However, it still only inserts a dollar sign at the main cursor.

Maybe it is actually some smartparens function that needs to be whitelisted such that the second dollar sign is inserted as well?

You could try disabling smartparens just to see if the issue is caused by it