I knew about the “Keyboard Shortcuts” modal for quite some time, but honestly didn’t know how they worked. Just now, when I investigated a bit further and read some specific instruction by another user, that I first have to j/k in a topic to go through the posts before I could use e and similar, I understood the concept behind it better.
Before I tried to combine the keys with alt, ctrl, shift in a random manner and didn’t get any further. Also just hitting e when focusing a post in a topic with the mouse - and nothing happened.
I think it would be need to
a) more information on usage to the Keyboard Shortcuts modal and
b) give feedback when you press e but have to j/k first:
Select a post by using j/k first.
as a “toast” or some similar kind of notification shown temporarily to the user as feedback would be nice. Could also include a link to a more elaborate “How to use Keyboard Shortcuts” explanation.