hmmm... are you describing something different to the behaviour shown in my picture below? Creating these irregular shaped go/no-go motion zones has been available for years. I've not upgraded my units yet (and won't be for some months), so I'm interested to see if this interface has changed at all.
View attachment 5071
(EDIT) You know, I hadn't had enough coffee - Reviewing your post, I'm assuming you're referring to editing SMART event zones via the NVR. (Historically a lot of people use the Cameras own SMART EVENT web interface as it gave more control) - but that's nice if you can do some more of this via the NVR now... nice!