In Word 2013, I can use Alt+= to open a new equation-editing textbox. As I have the Swiss keyboard layout, I actually press Alt+Shift+0 (zero) to achieve that. This is a bit more complicated to press, but at least it works.
When I hover over the "Insert->Formula" button in OneNote, it tells me that the shortcut is Alt+Entf:
"Entf" is short for "Entfernen" which is German for "remove" or "delete". Unfortunately, Alt+Delete does nothing at all in OneNote (and Alt+Shift+0 doesn't do anything either).
So I Googled. For Word, there are many tutorials how to change keyboard shortcuts: File -> Options -> Customize Ribbon -> some button
In OneNote, the settings are exactly the same – except for the fact that that button is not there...
I now need a way to add or edit the shortcuts of OneNote. I wouldn't mind if it is a hacky solution like a registry edit.
EDIT: Simulating Alt+= using AutoHotkey does not help.