No, I'm just used to use the NUMPAD_ENTER to confirm values I input in text fields, usually in the transforms or when there are many numbers to type in names.
So I guess the function I'm missing in this case is whatever function ENTER does that makes Spine apply the value and show me the result.
I always set up custom hotkeys as first thing when installing Spine, but those are for other functions, not involving the ENTER key.
I guess it's not a big deal and one could get used to press the regular ENTER after having used the numpad, but in the Windows version it worked out of the box so I was wondering why it's not the same here.
By the way I tried to assign the Search function to NUMPAD_ENTER as well and it works perfectly, but still doesn't confirm values in fields.