At this rate, I wouldn't hold your breath. It is frustrating - for sure. It is my #1 requested feature.
I'm sure it has not been easy to get working properly and account for all the different hardware it needs to run on.
As for getting that perpetual - I understand. It doesn't matter in the long run though, because at some point, to be compatible with ever-changing system software and drivers and all that you will have to upgrade and that will mean you will need to pay the subscription.
I'm in a similar boat, and have held on to the monthly payment in hopes the cross texture painting would arrive and I could cash out to a perpetual. I'm realizing now, just like every other software company that Adobe touches, subs are the way things are going to be. I don't like it, but it is what it is. This year is the first time since C4D version 7 that I did not renew my Maxon C4D because of their pressure to switch to subscription. Their new president is from Adobe.
We just have to wait and see, and hope for the best.