I personally have found WK to be absolutely amazing at doing what it sets out to do, so something like that definitely wouldn’t be a deal-breaker for me. But if it is for you then I do think you’ll need to look elsewhere (not that we don’t want you to stay!) because I really can’t see it being something that gets added any time soon, if ever.
I mean, really I’d suggest completing the free levels to see how you find it before deciding, because it only takes a couple of weeks and it’s free, so you haven’t exactly got much to lose. You sound pretty certain about it though.
Also, you could try posting in the thread for the override script? It should either be a known bug or is something they ought to hear about. I know you want it to be officially supported but it might fix the issue if you want to try the free levels with that script.