I've no idea if I'm the only one that's been frustrated by the fact that despite a box on a line showing as selected, it wouldn't accept a paste. I had to press a key then backspace then paste.
But it turns out that doing ctrl-v puts the edit box into editing mode and another ctrl+v plops the content into it.
This is with 12.5.2. I've no idea if this is how its always been or if this just happened. But either way, I'm :)
Just like to add that for me at least custom tags have been a godsend, I use them all the time.
Oh, OK, I can see that could be a useful trick. It wasn't deliberate on our part.
Sadly, it doesn't work on the Mac, but you can always click in the field to activate it.